The reading on the ac voltmeter is the voltage of the alternating emf, which is 140 V (rms).
When an ac voltmeter with large impedance is connected in a series circuit across an inductor, capacitor, and resistor that has an alternating emf of 140 V (rms), the meter will give the same reading in volts for each component.
This is because the impedance of each component depends on the frequency of the alternating emf.
In this case, the frequency is the same for all components, so the voltage drop across each is the same.
Therefore, the reading on the ac voltmeter is simply the voltage of the alternating emf, which is 140 V (rms).
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If the core of a star remaining after a supernova explosion has a mass between 1.4 and 3 solar masses, it collapses to form a
If the core of a star remaining after a supernova explosion has a mass between 1.4 and 3 solar masses, it collapses to form a neutron star. A neutron star is an incredibly dense object, with a mass greater than that of the sun, but a radius of only a few kilometers. It is composed almost entirely of neutrons, which are densely packed together.
The gravitational force on a neutron star is so strong that even light cannot escape, making it one of the most extreme objects in the universe.
If the core of a star remaining after a supernova explosion has a mass between 1.4 and 3 solar masses, it collapses to form a neutron star. A neutron star is a celestial object composed primarily of neutrons, which are subatomic particles found in atomic nuclei. When a star undergoes a supernova, the core contracts due to gravitational forces.
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g The inductance of a solenoid that is 16.0 cm long and has a cross-sectional area of 1.00 × 10-4 m2 is 1.00 mH. How many turns of wire does this solenoid have? (μ0 = 4π × 10-7 T ∙ m/A)
To find the number of turns of wire in the solenoid, we can use the formula for inductance:
L = (μ0 * N^2 * A * l) / (2 * h)
Where L is the inductance in henries, μ0 is the permeability of free space, N is the number of turns of wire, A is the cross-sectional area in square meters, l is the length of the solenoid in meters, and h is the height of the solenoid in meters (which we can assume is equal to its length).
Plugging in the given values, we get:
1.00 mH = (4π × 10^-7 T ∙ m/A) * N^2 * (1.00 × 10^-4 m^2) * (0.16 m) / (2 * 0.16 m)
Simplifying, we get:
1.00 mH = (1.26 × 10^-6) * N^2
Dividing both sides by (1.26 × 10^-6), we get:
N^2 = 793.65
Taking the square root of both sides, we get:
N ≈ 28.16
Therefore, the solenoid has approximately 28 turns of wire.
To calculate the number of turns of wire in the solenoid, we can use the formula for inductance (L) of a solenoid:
L = (μ₀ * N² * A) / l
Where: L = inductance (1.00 mH)
μ₀ = permeability of free space (4π × 10⁻⁷ T ∙ m/A)
N = number of turns of wire
A = cross-sectional area (1.00 × 10⁻⁴ m²)
l = length of the solenoid (16.0 cm or 0.16 m)
We need to find the value of N. Rearrange the formula to solve for N:
N² = (L * l) / (μ₀ * A)Now plug in the given values:
N² = (1.00 × 10⁻³ H * 0.16 m) / (4π × 10⁻⁷ T ∙ m/A * 1.00 × 10⁻⁴ m²)
Calculate N²:
N² ≈ 127323.95
Now take the square root to find the number of turns of wire:
N ≈ √127323.95
N ≈ 356.82
Since there cannot be a fraction of a turn, we can round up to the nearest whole number:
N ≈ 357 turns
So, the solenoid has approximately 357 turns of wire.
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Suppose a spring with spring constant 5 N/m is horizontal and has one end attached to a wall and the other end attached to a mass. You want to use the spring to weigh items. You put the spring into motion and find the frequency to be 0.3 Hz (cycles per second). What is the mass
The mass can be calculated using the formula:m = ((4π²k)/f²)where k is the spring constant, f is the frequency in Hz, and m is the mass in kilograms.
Plugging in the values given, we get:m = ((4π²*5 N/m)/(0.3 Hz)²) = 34.9 kgTherefore, the mass of the object attached to the spring is approximately 34.9 kilograms.This formula uses the relationship between the frequency of the spring's oscillation and the mass attached to it, based on the concept of Hooke's law. The spring constant is a measure of the stiffness of the spring, while the frequency is a measure of how quickly it oscillates. By using these values and the formula, we can calculate the mass that is attached to the spring.
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Two objects with different masses collide with and stick to each other. Compared to before the collision, the system of two objects after the collision has:
The system of two objects after the collision has the same total momentum as before the collision, but a lower total kinetic energy due to the loss of energy during the collision.
When two objects with different masses collide with and stick to each other, the resulting system has different properties compared to the individual objects before the collision. The key properties that change are the momentum and kinetic energy of the system.
Before the collision, each object has its own momentum, which is the product of its mass and velocity. The total momentum of the system before the collision is the sum of the momenta of the individual objects.
However, during the collision, the two objects exert forces on each other, and the total momentum of the system is conserved. This means that the total momentum of the system after the collision is equal to the total momentum before the collision.
Since the objects stick together after the collision, their velocities become the same, and the total momentum of the system can be calculated using the conservation of momentum equation. Therefore, the velocity of the combined object depends on the mass of each individual object.
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What resistance should be added in series with a 7.0-H inductor to complete an LR circuit with a time constant of 4.0 ms
A resistance of 1750 ohms should be added in series with the 7.0 H inductor to complete an LR circuit with a time constant of 4.0 ms.
To find the resistance needed to complete an LR circuit with a time constant of 4.0 ms, we can use the formula for the time constant of an LR circuit, which is:
τ = L/R
Where τ is the time constant, L is the inductance in henries, and R is the resistance in ohms.We are given the inductance L as 7.0 H and the time constant τ as 4.0 ms. We can rearrange the formula to solve for R:
R = L/τ
Substituting the given values, we get:
R = 7.0 H / 4.0 ms = 1750 ohms
It is important to note that the time constant of an LR circuit determines how quickly the current in the circuit reaches a steady state. A smaller time constant means that the current reaches its steady state more quickly, while a larger time constant means that it takes longer to reach a steady state.
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A wooden block of mass 11 kg is floating in a pool. This is a fresh water pool, so we can assume a density of 1000kg/m3. What is the volume of water displaced by this wooden block
The volume of water displaced by this wooden block is 0.011 cubic meters.
To find the volume of water displaced by the wooden block, we can use the principle of buoyancy. For an object to float, the buoyant force (which equals the weight of the displaced water) must be equal to the weight of the object. We can use the following equation:
Buoyant force = Weight of object
Since buoyant force = Density of water × Volume of displaced water × Gravity and Weight of object = Mass of object × Gravity, we can write the equation as:
Density of water × Volume of displaced water × Gravity = Mass of object × Gravity
Given the density of water as 1000 kg/m³ and the mass of the wooden block as 11 kg, we can solve for the volume of displaced water:
1000 kg/m³ × Volume of displaced water × 9.81 m/s² = 11 kg × 9.81 m/s²
Canceling out the gravity term and dividing both sides by 1000 kg/m³, we get:
Volume of displaced water = 11 kg / 1000 kg/m³ = 0.011 m³
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Americans love action movies, particularly those with a lot of violence. They are also very popular in other countries. What is the MOST likely way that this would shape international perceptions of American culture?
A.
Others will view the United States as a place with a lot of violence.
B.
Other cultures will see themselves like America and become violent.
C.
It will have little impact because everyone knows movies are not real.
D.
It will cause others to want to fight America since it is a violent country.
The MOST likely way that this would shape international perceptions of American culture is Others will view the United States as a place with a lot of violence.
option A.
How will it international perceptions of American culture?The portrayal of violence in American action movies may create a perception that the United States is a country with a high level of violence.
This perception may be based on the prevalence of action movies in American popular culture, which often depict intense and aggressive actions, gunfights, and other forms of violence.
The repeated exposure to such imagery through American movies could potentially shape international perceptions of the U.S. as a violent society.
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A 100- resistor, an 800-mH inductor and a capacitor are connected in series across a 60.0-Hz 120-V (peak) ac source. The approximate rms current in this circuit is Group of answer choices 1.59 A 0.86 A 0.79 A 1.2 A
The approximate RMS current in the circuit is 0.79 A. To explain further, we can use the formula for impedance of a series RLC circuit, which is given as Z = √(R^2 + (ωL - 1/ωC)^2), where R is the resistance, L is the inductance, C is the capacitance, and ω is the angular frequency of the source.
Substituting the given values, we get Z = √(100^2 + (2π*60*0.8 - 1/(2π*60*0.00001))^2) = 127.3 Ω. Using Ohm's Law, we can calculate the RMS current as I = V/RMS = V/Z = 120/127.3 = 0.94 A. However, this is the current magnitude, and we need to consider the phase angle between voltage and current. Using the tangent inverse of the imaginary part divided by the real part of impedance, we can find the phase angle to be about -43.6 degrees. Therefore, the approximate RMS current is I = 0.94 * cos(-43.6) = 0.79 A, which is the answer.
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According to the logistic growth equation Nt = N1 + rN1 [(K - N1)/ K])...Select only ONE answer choice.Group of answer choicesthe number of individuals added per unit time is zero when N equals K.the number of individuals added per unit time is greatest when N is close to zero.the per capita growth rate (r) increases as N approaches K.the population grows exponentially when K is small.
The correct answer is: The number of individuals added per unit of time is zero when N equals K. This is because the logistic growth equation represents a population growth model that takes into account the carrying capacity (K) of the environment.
When the population size (N) reaches the carrying capacity, the growth rate of the population becomes zero, and the population stops growing. This is because the environment can no longer support any more individuals beyond the carrying capacity. As a result, choice A is the right response.
Option B is incorrect because the growth rate is highest when the population size is small, not close to zero. Option C is also incorrect because the per capita growth rate decreases as the population size approaches the carrying capacity. Finally, option D is incorrect because the logistic growth model is a type of growth that is limited by the carrying capacity, so it does not grow exponentially.
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A 56 kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant of the bungee cord, assuming it has negligible mass compared to that of the jumper
A 56 kg bungee jumper jumps undergoes simple harmonic motion, the period of oscillation is 11.2 s then spring constant of the bungee cord is 44.99 N/m.
For find the spring constant (k) of the bungee cord, we can use the formula for the period of oscillation in simple harmonic motion:
T = 2π√(m/k)
Where T is the period of oscillation, m is the mass of the jumper, and k is the spring constant.
Given:
T = 11.2 s
m = 56 kg
Now, we need to rearrange the formula to solve for k:
k = (4π²m) / T²
Plug in the given values:
k = (4π²(56)) / (11.2)²
Calculate the result:
k ≈ 44.99 N/m
So, the spring constant of the bungee cord is approximately 44.99 N/m.
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A 30-turn circular coil of radius 4.00 cm and resistance 1.00 V is placed in a magnetic field directed perpen- dicular to the plane of the coil. The magnitude of the magnetic field varies in time according to the expres- sion B 5 0.010 0t 1 0.040 0t 2, where B is in teslas and t is in seconds. Calculate the induced emf in the coil at t 5 5.00 s.
According to the question -61.8 mV is the induced emf in the coil at t 5 5.00 s.
What do the two laws of Faraday say?
The first law states that an EMF is induced in a coil anytime the magnetic flux associated with that coil changes. The second law indicates that the coil's rate of change in magnetic flux and the amount of EMF it induces are directly inversely correlated.
The electric potential created by an electrochemical cell or by modifying the magnetic field is referred to as electromotive force. The abbreviation for electromotive force is EMF. Energy is transformed from one form to another using a generator or a battery.
E=-(dΦ_B)/dt
=-d(NBA)/dt
=-NA dB/dt
=-Nπr²d/dt (0.01t+0.04t² )
=-Nπr² (0.01+0.08t),
E(t=5 s)=-30∙π(0.04 m)² (0.01+0.08∙5 s)
=-0.0618 V
=-61.8 mV.
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The induced emf in the coil at t = 5.00 s is -0.078 V. The negative sign indicates that the direction of the induced emf is opposite to the direction of the current that would be produced by the applied magnetic field.
When a coil is placed in a changing magnetic field, an electric field is induced, which results in an induced emf. The induced emf in a coil is given by Faraday's law of electromagnetic induction, which states that the magnitude of the induced emf is equal to the rate of change of the magnetic flux through the coil.
The magnetic flux through the coil is given by the product of the magnetic field strength and the area of the coil. For a circular coil, the area is given by πr², where r is the radius of the coil. Thus, the magnetic flux through the coil is given by Φ = Bπr², where B is the magnetic field strength.
The rate of change of the magnetic flux through the coil is given by the time derivative of the magnetic flux, which is dΦ/dt = πr²dB/dt. Therefore, the induced emf in the coil is given by:
ε = -N(dΦ/dt),
where N is the number of turns in the coil. The negative sign in the equation indicates that the induced emf is in a direction that opposes the change in magnetic flux.
Substituting the expression for B given in the problem statement, we obtain:
dB/dt = 0.010 + 0.080t
At t = 5.00 s, we have:
dB/dt = 0.010 + 0.080(5.00) = 0.410 T/s
Substituting the values for N, r, and dB/dt, we obtain:
ε = -N(dΦ/dt) = -30(π(0.04)²)(0.410) = -0.078 V
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At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll collector. What is the purpose of this wire
The purpose of the thin metal wire sticking up from the road at some automobile toll-collecting stations is to count the number of axles on the vehicle.
As vehicles drive over the wire, the electrical circuit is completed, and the toll-collecting system can determine the number of axles on the vehicle. This information is crucial in determining the appropriate toll fee for the vehicle. For example, a vehicle with more axles (such as a large truck) may be charged a higher toll fee than a vehicle with fewer axles (such as a car). Therefore, the wire helps to ensure that each vehicle is charged the correct amount for using the toll road.
The wire makes contact with the car, allowing the built-up static charge to safely discharge to the ground, preventing any potential harm or discomfort to the toll collector when they touch the car.
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Consider a top consisting of a uniform cone spinning freely about its tip at 1800 rpm. If its height is 10 cm and its base radius 2.5 cm, at what angular velocity will it precess
The angular velocity at which the top will precess is approximately 28.8 rad/s.
To calculate the angular velocity of precession, we need to first find the moment of inertia (I) and the angular momentum (L) of the spinning cone.
The moment of inertia for a uniform cone about its tip is given by the formula I = (3/10)MR², where M is the mass and R is the base radius.
The angular velocity of the spinning cone (ω) is given by 1800 rpm, which we convert to rad/s: ω = (1800 * 2π) / 60 ≈ 188.5 rad/s. The angular momentum L = Iω.
To find the angular velocity of precession (Ω), we use the formula Ω = (mgR) / L, where m is the mass, g is the gravitational acceleration (approximately 9.81 m/s²), and R is the base radius. Since we don't know the mass, we can rewrite this formula in terms of I: Ω = (mgR) / (Iω).
Substituting the values, we get: Ω = (9.81 * 10/100 * 2.5/100) / ((3/10) * 2.5/100 * 188.5). Solving this equation, we get Ω ≈ 28.8 rad/s.
Summary: A uniform cone spinning freely about its tip at 1800 rpm, with a height of 10 cm and a base radius of 2.5 cm, will precess at an angular velocity of approximately 28.8 rad/s.
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A uniform solid sphere has a mass M and radius R. What is the moment of inertia of the sphere about an axis that is tangent to the surface of the sphere
The moment of inertia of the sphere about an axis that is tangent to itsurface is [tex]\frac{7}{5}MR^2$.[/tex]
The moment of inertia of a uniform solid sphere of mass [tex]$M$[/tex]and radius [tex]$R$[/tex] about an axis passing through its center of mass is given by the expression:
[tex]$$I = \frac{2}{5}MR^2$$[/tex]
To find the moment of inertia about an axis that is tangent to the surface of the sphere, we can use the parallel axis theorem, which states that the moment of inertia of a rigid body about any axis is equal to the moment of inertia about a parallel axis through the center of mass plus the product of the mass and the square of the distance between the two axes. In this case, the distance between the two axes is equal to the radius of the sphere, or [tex]$R$.[/tex]
Therefore, the moment of inertia of the sphere about an axis that is tangent to its surface is given by:
[tex]$$I_{\text{tangent}} = I_{\text{center of mass}} + MR^2 = \frac{2}{5}MR^2 + MR^2 = \frac{7}{5}MR^2$$[/tex]
Therefore, the moment of inertia of the sphere about an axis that is tangent to its surface is [tex]\frac{7}{5}MR^2$.[/tex]
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A force compresses a bone by 2.0 mm. A second bone has the same cross-sectional area but twice the length as the first. By how much would the same force compress this second bone
The compression of the second bone under the same force will be twice that of the first bone, i.e., 4.0 mm.
The compression of a bone under a given force is related to the bone's modulus of elasticity and its cross-sectional area and length.
Let's assume that the first bone has a cross-sectional area A and a length L, and that the second bone has the same cross-sectional area A but twice the length, i.e., 2L.
The compression of the first bone is given by:
ΔL1 = F L / A E
where F is the force, E is the modulus of elasticity of the bone, and ΔL1 is the compression of the bone.
We can rearrange this equation to solve for the force:
F = ΔL1 A E / L
Using the same force on the second bone, its compression will be:
ΔL2 = F (2L) / A E
Substituting the expression for F from the first equation into the second equation, we get:
ΔL2 = ΔL1 (2L / L) = 2ΔL1
Therefore, the compression of the second bone under the same force will be twice that of the first bone, i.e., 4.0 mm.
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A solenoid 1.30 m long and 2.60 cm in diameter carries a current of 18.0 A. The magnetic field inside the solenoid is 23.0 mT. Find the length of the wire forming the solenoid.
Therefore, the length of the wire forming the solenoid is approximately 0.106 m when magnetic field inside the solenoid is 23.0 mT.
The magnetic field inside a solenoid can be given as:
B = μ₀nI
where B is the magnetic field, μ₀ is the permeability of free space, n is the number of turns per unit length, and I is the current.
The number of turns per unit length can be given as:
n = N/L
where N is the total number of turns and L is the length of the solenoid.
Combining these equations, we get:
B = μ₀NLI
Solving for N/L, we get:
N/L = B/(μ₀I)
Substituting the given values, we get:
N/L = (23.0 × 10⁻³ T)/(4π × 10⁻⁷ T·m/A × 18.0 A)
≈ 100 turns/m
The total number of turns can be found by multiplying the number of turns per unit length by the length:
N = (100 turns/m) × 1.30 m
≈ 130 turns
The length of wire can be found by multiplying the total number of turns by the circumference of the solenoid:
L_wire = N × πd
≈ 1.30 m × π × 0.0260 m
≈ 0.106 m
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In a ________ fault, the fault plane is non-vertical and the hanging wall block moves downward relative to the footwall block.
In a normal fault, the fault plane is non-vertical and the hanging wall block moves downward relative to the footwall block.
In a normal fault, the fault plane is non-vertical and the hanging wall block moves downward relative to the footwall block. This type of fault is caused by tensional stress, which pulls the rocks apart and causes the hanging wall to move downward. When tensional stress is applied to a rock, it stretches and thins, eventually reaching a breaking point. This breaking point occurs along a fault plane, which is the boundary between two blocks of rock. The hanging wall block moves downward because it is the block that is above the fault plane and is therefore subject to gravity. The footwall block, on the other hand, remains stationary.
A normal fault is characterized by a non-vertical fault plane and the downward movement of the hanging wall block in relation to the footwall block, resulting from tensional forces in the Earth's crust.
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An Atwood machine consists of a mass of 3.5 kg connected by a light string to a mass of 6.0 kg over a frictionless pulley with a moment of inertia of 0.0352 kg ∙ m2 and a radius of 12.5 cm. If the system is released from rest, what is the speed of the masses after they have moved through 1.25 m if the string does not slip on the pulley?
2.28m/s is the speed of the masses after they have moved through 1.25 m if the string does not slip on the pulley
What does string force mean?
The pulling force transmitted axially by a string, rope, chain, or similar object, or by each end of a rod, truss member, or similar three-dimensional object is referred to as tension. The action-reaction pair of forces acting at each end of the aforementioned elements may also be referred to as tension.
Ki+Ui = K + Uf
Kf+Uf-(Ki+ U₁) = (Kƒ-K;) + (Uƒ- U₁)=0JK =0J,
Uf-Ui = m1ghi+m2gh2f-(mighii+m2ghzi) = mig(hif-hii)+m2g h2i)
h=1.25m
Uf-U₁ = m1gh-ma2gh = gh(m1 - m2)
Now we have:
(Kf-Ki) + (Uf-Ui) = (m1+m2 +i/r2)v^2/2 +gh(m-m2) = 0.J
v =sqrt (2gh(m2-mi) /mi+m2+ i/r2)
=sqrt(2(9.8m/s2)(1.25m)(6.0kg-3.5kg) /3.5kg+6.0kg+0.0352 kgm2/ (0.125m)2)
=2.28m/s
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If an object is moving to the left at a constant speed and you are rotating your eyes to the left at twice the speed, you will see the object moving:
If an object is moving to the left at a constant speed and you are rotating your eyes to the left at twice the speed, you will see the object moving in the opposite direction, to the right.
This is because of the way our eyes perceive motion. Our eyes are constantly moving, even when we are focusing on a stationary object. When we move our eyes to track a moving object, we create a blur of the object in our field of vision. The direction of the blur depends on the speed and direction of our eye movements relative to the object's movement.
In this case, if the object is moving to the left at a constant speed, and we are rotating our eyes to the left at twice the speed, the blur of the object in our field of vision will be moving to the right. This creates the illusion that the object is moving to the right, even though it is actually moving to the left. This phenomenon is known as the motion aftereffect, and it occurs because our brain's visual processing system adapts to the constant motion, creating a sort of "lag" in our perception of the object's movement. Overall, this effect highlights the complexity of our visual perception system and the way in which our brains interpret visual information.
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If each component has a plate contact surface area of 1 cm2 and the corresponding contact resistance is 2 104 m2 K/W, what is the component temperature
(a) To determine the temperature of the copper plate, we can use the formula:
Q = m_dot x Cp x (T_out - T_in)
where Q is the heat transfer rate, m_dot is the mass flow rate of water, Cp is the specific heat capacity of water, and T_out and T_in are the outlet and inlet temperatures of the water, respectively.
The heat transfer rate can be calculated as:
Q = 100 x 25 W = 2500 W
The mass flow rate of water can be calculated as:
m_dot = rho x V x A
where rho is the density of water, V is the velocity of water, and A is the area of the plate.
rho = 1000 kg/m³ (density of water)
V = 2 m/s (given)
A = 0.2 m x 0.2 m = 0.04 m² (area of the plate)
Therefore, m_dot = 1000 kg/m³x 2 m/s x 0.04 m² = 80 kg/s
The specific heat capacity of water is Cp = 4186 J/kg-K.The outlet temperature of the water is given as T_out = 17°C = 290 K (approx).
Assuming the copper plate is isothermal, we can equate the heat transfer rate to the thermal energy generated by the components:
Q = 100 x P
where P is the power dissipation per component.
Therefore, P = Q/100 = 25 W
The contact resistance between the component and the copper plate is given as 2 x 10⁴ m² K/W. The contact area between each component and the copper plate is 1 cm²= 0.0001 m².
Using the formula for the thermal resistance of a component:
R_th = 1/(h x A_c)
where h is the heat transfer coefficient and A_c is the contact area, we can calculate the value of h:
R_th = 2 x 10⁴m² K/W
A_c = 0.0001 m²
Therefore, h = 1/(R_th x A_c) = 5000 W/m² K
Assuming the components are at a uniform temperature, we can use the formula for convection heat transfer to calculate the component temperature:
P = h x A_c x (T_plate - T_comp)
where T_comp is the component temperature.
Rearranging the formula, we get:
T_comp = T_plate - (P/(h x A_c))
The temperature of the copper plate is approximately 82.3°C, which can be calculated using the first formula.
Plugging in the values, we get:
Q = 80 kg/s x 4186 J/kg-K x (290 K - T_plate)
Solving for T_plate, we get:
T_plate = 82.3°C
(b) The component temperature can be calculated using the second formula:
T_comp = T_plate - (P/(h x A_c))
Plugging in the values, we get:
T_comp = 82.3°C - (25 W/(5000 W/m² K x 0.0001 m²)) = 57.3°C
Therefore, the temperature of each component is approximately 57.3°C.
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One hundred electrical components, each dissipating 25 W, are attached to one surface of a square (0.2 m × 0.2 m) copper plate, and all the dissipated energy is transferred to water in parallel flow over the opposite surface. A protuberance at the leading edge of the plate acts to trip the boundary layer, and the plate itself may be assumed to be isothermal. The water velocity and temperature are "-= 2 m/s and T-= 17°C, and the water's thermophys- ical properties may be approximated as V 0.96 x 10- m2/s, k-0.620 W/m-K, and Pr-5.2. Copper plate, T, Contact area, Ac and Water resistance, Rin UUUUUUUUUUT?: Boundary ayer trip , L= 0.2 m (a) What is the temperature of the copper plate? (b) If each component has a plate contact surface area 1 cm2 and the corresponding contact resistance is 2 x 104m2. K/W, what is the component tempera- ture? Neglect the temperature variation across the thickness of the copper plate. of
Calculate the radius of the transiting planet. The planetary transits block 2 % of the star's light. The star TrES-1 has a radius of about 85 % of our Sun's radius.
based n the given information, the radius of the transiting planet is approximately 84,132 km.
To calculate the radius of the transiting planet, we need to consider the blocked light percentage and the radius of the star TrES-1. The planet blocks 2% of the star's light, which means that the ratio of the planet's area to the star's area is 0.02.
The star TrES-1 has a radius of 85% of our Sun's radius. Since the radius of the Sun is approximately 696,340 km, the radius of TrES-1 would be 0.85 * 696,340 km ≈ 592,089 km.
To find the planet's radius, we can use the formula for the area of a circle, A = πr². The ratio of the areas can be written as (πr_planet²) / (πr_star²) = 0.02. By substituting the known values, we can cancel out π and solve for the planet's radius:
r_planet² / 592,089² = 0.02
r_planet² ≈ 0.02 * 592,089²
r_planet ≈ √(0.02 * 592,089²) ≈ 84,132 km
The radius of the transiting planet is approximately 84,132 km.
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A photon of initial energy 0.1 MeV undergoes Comptom scattering at an angle 0f 60o . Find (a) the energy of the scattered photon (b) the recoil energy of the electron (c) the scatteri
(a) The energy of the scattered photon is 0.066 MeV.
(b) The recoil energy of the electron is 0.034 MeV.
(c) The scattering angle of the electron is 120 degrees.
Compton scattering is the inelastic scattering of a photon by an electron, which results in a decrease in the photon's energy and the recoil of the electron.
The energy of the scattered photon can be calculated using the Compton formula, which gives the scattered photon energy as a function of the incident photon energy and the scattering angle.
In this case, the scattered photon energy is 0.066 MeV, which is lower than the incident photon energy of 0.1 MeV.
The recoil energy of the electron can also be calculated using the conservation of energy and momentum, and is found to be 0.034 MeV. Finally, the scattering angle of the electron can be calculated using the conservation of momentum, and is found to be 120 degrees.
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Calculate the ratio of acceleration of the proton to g=9.8m/s2. Express your answer using two significant figures.
The ratio of acceleration of a proton to g=9.8 m/s^2 can be calculated using the following formula: Ratio of acceleration = Acceleration of proton / Acceleration due to gravity (g).
The acceleration of a proton can be calculated using the formula:
Acceleration = Force / Mass
The force acting on a proton can be determined based on the electric field it experiences. However, assuming the proton is in freefall under the influence of gravity only, the force acting on the proton would be its weight, which can be calculated as:
Force = Mass x Acceleration due to gravity (g)
Therefore, the acceleration of a proton in freefall under the influence of gravity would be:
Acceleration = Force / Mass = (Mass x g) / Mass = g
Thus, the ratio of acceleration of a proton to g is:
Ratio of acceleration = g / g = 1
Therefore, the ratio of acceleration of a proton to g is 1, which means that the acceleration of a proton in freefall is equal to the acceleration due to gravity.
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a mixture of he, ne, and ar has a pressure of 30.0 atm at 28.0 °c. if the partial pressure of he is 3.85 atm and the partial pressure of ar is 2.68 atm, what is the partial pressure of ne?
Partial pressure of Ne = 23.47 atm
To find the partial pressure of Ne, we can use the formula:
Total pressure = Partial pressure of He + Partial pressure of Ne + Partial pressure of Ar
Substituting the given values, we get:
30.0 atm = 3.85 atm + Partial pressure of Ne + 2.68 atm
Solving for Partial pressure of Ne, we get:
Partial pressure of Ne = 23.47 atm
Therefore, the partial pressure of Ne in the mixture is 23.47 atm.
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Sirius is an A0 V star. It has a tiny white dwarf star orbiting around it, that has essentially the same B-V color index. How many magnitudes brighter, and how many times more luminous, is Sirius than its tiny companion star
Sirius is many magnitudes brighter and significantly more luminous than its tiny white dwarf. This difference is due to the size and mass of the two stars, and highlights the vast diversity that can be found within the universe.
Sirius is one of the brightest stars in the night sky, and it is classified as an A0 V star. It has a small white dwarf companion star orbiting around it, which has a similar B-V color index. However, despite their similarities, Sirius is significantly brighter and more luminous than its tiny companion star.
In terms of magnitude, Sirius has an apparent magnitude of -1.46, while its companion has an apparent magnitude of around +8.4. This means that Sirius is around 10,000 times brighter than its companion star. In terms of luminosity, Sirius is estimated to be around 25 times more luminous than the sun, while its companion star is only a fraction of the sun's luminosity.
The reason for this vast difference in brightness and luminosity is due to the size and mass of the two stars. Sirius is a much larger and more massive star than its companion, which is why it is much brighter and more luminous. Despite its small size, the companion star is still interesting to study and can provide valuable insights into the nature of white dwarf stars.
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Between two ports, on a river, a ship travels a distance of 140 km in the direction of the current in 4 hours, and against the current in 8 hours. What is the speed of the river current
A ship travels a distance of 140 km in the direction of the current in 4 hours, and against the current in 8 hours, the speed of the river current is 8.75 km/h.
To determine the speed of the river current, we need to consider the distance traveled by the ship between two ports along the river, which is 140 km, the time taken to travel in the direction of the current (4 hours), and against the current (8 hours).
First, let's find the ship's speed in both directions. The speed in the direction of the current can be calculated as 140 km / 4 hours = 35 km/h, and the speed against the current can be calculated as 140 km / 8 hours = 17.5 km/h.
Now, let's denote the ship's speed in still water as 's' and the speed of the river current as 'c'. The formula for the ship's speed in the direction of the current is (s + c) and against the current is (s - c).
Using the given information, we can create two equations:
1. s + c = 35 km/h
2. s - c = 17.5 km/h
By adding both equations, we can eliminate 'c' and solve for 's':
s + c + s - c = 35 + 17.5
2s = 52.5
s = 26.25 km/h
Now, we can use 's' to find the speed of the river current by substituting it in either equation, let's use equation 1:
26.25 + c = 35
c = 35 - 26.25
c = 8.75 km/h
So, the speed of the river current is 8.75 km/h.
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A basketball and a golfball are heading toward each other, each with a speed of 2 m/s. The balls then collide head-on. If the basketball weighs 5 times as much as the golfball, and the collision can be considered elastic, what is the final speed of the golfball
If the basketball weighs 5 times as much as the golfball, and the collision can be considered elastic, the final speed of the golf ball (v1') is 6 m/s.
Using the given information, we can analyze this elastic collision using the conservation of momentum and kinetic energy principles. Let m1 be the mass of the golf ball and m2 be the mass of the basketball (m2 = 5m1). Initial velocities are v1 = 2 m/s (golf ball) and v2 = -2 m/s (basketball, since it's moving opposite direction).
After the collision, let the final velocities be v1' for the golf ball and v2' for the basketball.
Conservation of momentum equation: m1v1 + m2v2 = m1v1' + m2v2'
Conservation of kinetic energy equation: (1/2)m1v1² + (1/2)m2v2² = (1/2)m1(v1')² + (1/2)m2(v2')²
By solving these two equations simultaneously, we find that the final speed of the golf ball (v1') is 6 m/s.
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How much energy is stored in a 2.90- cm -diameter, 12.0- cm -long solenoid that has 200 turns of wire and carries a current of 0.780 A
Answer:
The energy stored in a 2.90- cm -diameter, 12.0- cm -long solenoid that has 200 turns of wire and carries a current of 0.780 A is approximately 0.0153 J.
Explanation:
The energy stored in a solenoid can be calculated using the formula:
U = (1/2) * L * I^2
where U is the energy stored, L is the inductance of the solenoid, and I is the current flowing through the solenoid.
The inductance of a solenoid can be approximated as:
L = (μ * N^2 * A) / l
where μ is the permeability of free space (4π × 10^-7 T·m/A), N is the number of turns of wire in the solenoid, A is the cross-sectional area of the solenoid, and l is the length of the solenoid.
First, we need to calculate the inductance of the solenoid:
A = π * (d/2)^2 = π * (2.90 cm / 2)^2 = 6.626 cm^2
l = 12.0 cm
N = 200
μ = 4π × 10^-7 T·m/A
L = (4π × 10^-7 T·m/A) * (200^2) * (6.626 cm^2) / (12.0 cm) = 0.0502 H
Next, we can use the given current value to calculate the energy stored:
I = 0.780 A
U = (1/2) * (0.0502 H) * (0.780 A)^2 = 0.0153 J
Therefore, the energy stored in the solenoid is approximately 0.0153 J.
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what term is used to describe the relationship between how far a person falls and the length of rope that is available to catch that fall
The term used to describe the relationship between how far a person falls and the length of rope that is available to catch that fall is "fall factor."
The "fall factor" is a term used in rock climbing to describe the amount of force generated on the climber's equipment in the event of a fall. It is calculated by dividing the length of the fall by the amount of rope available to absorb the fall. For example, if a climber falls 5 feet with only 2.5 feet of rope available to absorb the fall, the fall factor would be 2 (5 divided by 2.5).
The fall factor is important because it determines the amount of force that is applied to the climber's gear, such as the rope, carabiners, and anchors. Higher fall factors result in greater forces, which can increase the risk of equipment failure and lead to more serious injuries in the event of a fall. To reduce the risk of high fall factors, climbers can take precautions such as placing protection gear more frequently, using longer ropes, and avoiding falls from significant heights.
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A 0.5 solar mass main sequence star is at a larger distance than a 4 solar mass main sequence star. Which star appears brighter
The 4 solar mass main sequence star appears brighter due to its higher luminosity.
The brightness of a star is determined by its luminosity and distance from Earth. Luminosity refers to the total amount of energy emitted by the star per unit time, while distance refers to the physical distance between the star and Earth.
A 4 solar mass main sequence star has a higher luminosity than a 0.5 solar mass main sequence star due to its larger size and higher rate of energy production through nuclear fusion.
However, even though the 0.5 solar mass star is at a larger distance from Earth, its lower luminosity means that it will appear dimmer than the 4 solar mass star.
Therefore, the 4 solar mass main sequence star appears brighter than the 0.5 solar mass star, despite being closer to Earth.
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