A. Position the item on one side of a lever, a certain distance from the fulcrum. Position known masses on the other side of the fulcrum so that they are also spaced along the lever at a known distance from the fulcrum.
What constitutes a lever system's fulcrum?The fulcrum is the term used to describe the beam's pivotal point. When force is applied to one end of a lever, a load is applied at the other end.
What in a basic machine is a fulcrum?You push or pull on this portion. The point on which the lever rotates or balances is known as the "fulcrum." Your hand's fingers serve as the fulcrum when using a fork. Scissors are actually two levers combined. Commonly known as a fixed lever, the handle on the toilet flusher.
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a cooler (mass 3.6 kg) is initially at rest on a horizontal floor. it is then pushed in a straight line for 2 m by a small child who exerts a horizontal force with magnitude 30 n.
A.) Use the Work-Energy Theorem to determine the final speed of the cooler if there is no friction between the cooler and the floor. B.) Use the Work-Energy Theorem to determine the final speed of the cooler if the coefficient of kinetic friction between the cooler and the floor is 0.30.
(a) The final speed of the cooler is 5.77 m/s.
(b) In the presence of friction, the final speed of the cooler is 3.43 m/s.
What is the final speed of the cooler?
The final speed of the cooler is calculated by applying work energy theorem as shown below;
Change in kinetic energy of the cooler = work done on the cooler
¹/₂mv² = fd
v² = (2fd) / m
v = √(2fd) / m
where;
f is the applied forced is the displacement of the coolerm is the mass of the coolerThe final speed of the cooler is calculated as;
v = √(2 x 30 x 2) / 3.6
v = 5.77 m/s
At the given coefficient of friction, the final speed is calculated as;
v = √(2Ffd) / m
where;
Ff is force of frictionFf = μW
where;
μ is coefficient of frictionW is the normal forcev = √(2μWd) / m
v = √(2 x 0.3 x 3.6 x 9.8 x 2) / 3.6
v = 3.43 m/s
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According to Newton's third law, what is the reaction force in the previous question to the normal force of the person on the floor? A. The gravitational pull of the person on Earth B. The gravitational pull of the box on Earth C. The force of the box on the person D. The normal force of the floor on the box E. The weight of the box F. The weight of the person G. The normal force of the box on the floor H. The force of the person on the box I. The normal force of the floor on the person
Answer:
A
Explanation:
A student wants to launch a toy dart toward a target that hangs from a light string: As time t = 0,the dart is launched with an initial speed v at an angle 0 above the horizontal ground: At the instant the dart is launched, the string is cut such that the target begins to fall straight down. The positive horizontal direction is considered to be to the right, and the positive vertical direction is considered to be up.
A student wants to launch a toy dart As time t = 0, release a ball that has been resting near the Earth's surface. Allow a cart to leave rest and move down a 40°40° inclination with regard to the ground.
The graphs which could represent the vertical component of the velocity as a function of time for the dart and the target immediately after the dart is launched and the target begins to fall is Dart: above x-axis, decreasing; Target: below x-axis, decreasing.
Velocity is the directional speed of a moving object as an indicator of the rate at which its position changes as perceived from a given frame of reference and measured by a particular standard of time. The idea of speed is important in kinematics, the part of classical mechanics that explains the motion of things.
Velocity is a physical vector quantity that requires both magnitude and direction to be determined. Velocity is a scalar absolute value of speed, a consistently derived unit whose quantity is measured in SI (metric system) in meters per second.
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The above question is incomplete, the complete question is-
A student wants to launch a toy dart toward a target that hangs from a light string. At time t=0, the dart is launched with an initial speed v0 at an angle θ0 above the horizontal ground. At the instant the dart is launched, the string is cut such that the target begins to fall straight down. The positive horizontal direction is considered to be to the right, and the positive vertical direction is considered to be up.
Which of the following graphs could represent the vertical component of the velocity as a function of time for the dart and the target immediately after the dart is launched and the target begins to fall?
If 2 J of wok is done in raising a 180 g red delicious apple to bring it to your mouth to take a bite of the apple, how far is it lifted?
Answer:1.13m
Explanation:
Potential Energy= mgh
m= mass(kg)
g= gravitational field strength(9.81m/s^2)
h= height
PE=mgh
PE= 2J
therefore: 2J= 0.180kg x 9.81 m/s^2 x h
h= 2/(1.764)
h= 1.13m
a parallel-plate vacuum capacitor is connected to a battery and charged until the stored electric energy is u. the battery is removed, and then a dielectric material with dielectric constant k is inserted into the capacitor, filling the space between the plates. finally, the capacitor is fully discharged through a resistor (which is connected across the capacitor terminals).
All of the electrical energy held in the capacitor is released as heat when it is fully discharged through the resistor.
What purpose does a capacitor serve?Two conductors that are separated from one another and positioned close to one another make up a capacitor, an electrical energy storage device.A straightforward illustration of one such storage device is a parallel-plate capacitor.
The following formula can be used to determine how much energy was lost inside the resistor:
= ½ × ×
A parallel-plate capacitor's capacitance is determined by:
= × 0 × /,
Since the capacitor is charged until the stored electric energy is , we can write:
½ × × =
Solving for gives:
= 2 × /
Substituting this expression for into the formula for, we get:
½ × × ² × ( − 1)
(B) The potential difference across the capacitor will rise as long as the charging battery is still attached and the dielectric is inserted because of the higher capacitance. The following formula can be used to compute the new potential difference:
The capacitor's newly accumulated electrical energy is:
½ × × × ²
= ½ × × ² × ( − 1)
= ½ × × ² × ( − 1)
= ½ × × (² − ²)
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Question:
A parallel-plate vacuum capacitor is connected to a battery and charged until the stored electric energy is . The battery is removed, and then a dielectric material with dielectric constant is inserted into the capacitor, filling the space between the plates. Finally, the capacitor is fully discharged through a resistor (a resistor is connected across the capacitor terminals).
A) Find , the energy dissipated in the resistor.
Express your answer in terms of and other given quantities.
B)Consider the same situation as in the previous part, except that the charging battery remains connected while the dielectric is inserted. (Part B figure) The battery is then disconnected and the capacitor discharged. For this situation, what is , the energy dissipated in the resistor?
Express your answer in terms of and other given quantities.
Introduce CT scan and explain its working mechanism.
Help!!
A horse does 860 J of work in 420 seconds while pulling a wagon. What is the power output of the horse? Round your answer to the nearest whole number.
The power output of the horse is [???] W.
The area labeled B is four times the area labeled A. Express b in terms of a.
The x y-coordinate plane is given. A curve and shaded region are graphed.
The curve y = ex enters the window in the second quadrant, goes up and right, crosses the y-axis becoming more steep, then exits the window in the first quadrant.
The shaded region A is below the curve and above the x-axis between x = 0 and x = a.
b in terms of a that satisfies the given condition is, [tex]b = \ln(3e^a - 2)[/tex].
The equation of the curve is y = e^x.
The shaded region A is the area under the curve between x = 0 and x = a, so its area is given by,
[tex]A = \int_0^a e^x dx = e^a - 1[/tex]
The area labeled B is four times the area labeled A, so its area is given by,
B = 4A = 4(e^a - 1)
To express b in terms of a, find the value of b that satisfies,
[tex]\int_0^a e^x dx = 3(e^a - 1)[/tex]
Using the formula for the integral of e^x, we get:
[tex]e^b - e^a = 3(e^a - 1)[/tex]
Solving for b, we get:
[tex]b = \ln(3e^a - 2)[/tex]
So the area labeled B is [tex]4(e^a - 1)[/tex], and the value of b that satisfies the given condition is [tex]b = \ln(3e^a - 2)[/tex].
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Calculate the height to which water at 4°C will rise in a capillary tube of 0.5 × 10^-3 m diameter. (Given g=9.8 m/s^2; angle of contact 0°; surface tension= 0.072 N/m.
Step-by-step Explanation
Given: Diameter (D) of the capillary tube = m
Surface Tension (T) =
The angle of contact () =
Acceleration due to gravity (g) =
The temperature of water =
To Find: The height (h) of rising of water in the capillary tube
Solution:
Formula to find the height of the rise
The following expression is used to find the height (h) of rising of water in the capillary tube;
Where, is the density of water, and is the radius of the capillary tube.
Calculating the height of the rise in the capillary tube
Since the diameter of the capillary tube is , the radius of the tube will be;
And, at , the density of water is
Substituting all the required values in the above formula, we get;
Hence, the water will rise in a capillary tube to a height of
George is pushing his 20kg son, Jake, on the swing at the park. He pulls his son up to a height of 2m, pauses, and lets him go. What is Jake's kinetic energy before his dad lets go of the swing? What is Jake's kinetic energy at the lowest point? What is Jake's velocity at the top of the lowest point?
Jake's velocity at the lowest point of the swing is 7 m/s.
What is kinetic and potential energy?Potential energy is the energy stored in any object or system due to the position or arrangement of its parts. It is, however, unaffected by factors outside of the object or system, such as air or height. Kinetic energy, on the other hand, is the energy of moving particles in an object or system.
To solve this problem, we need to use the conservation of energy principle, which states that the total energy in a system remains constant.
At the highest point, Jake has potential energy (due to his position above the ground), but no kinetic energy (since he is not moving).
As he swings down, his potential energy is converted to kinetic energy, and at the lowest point of the swing, he has the maximum kinetic energy and minimum potential energy. Then, as he swings back up, the process is reversed.
To calculate Jake's potential energy at the top of the swing, we use the formula:
PE = mgh
where m is the mass of Jake, g is the acceleration due to gravity (9.8 m/s²), and h is the height above the ground. Substituting in the values, we get:
PE = (20 kg)(9.8 m/s²)(2 m) = 392 J
This is Jake's potential energy at the top of the swing. At this point, he has no kinetic energy.
At the lowest point of the swing, Jake has converted all of his potential energy into kinetic energy. We can use the conservation of energy principle to find his kinetic energy at this point:
KE = PE
where KE is kinetic energy and PE is potential energy. Substituting in the values, we get:
KE = 392 J
This is Jake's kinetic energy at the lowest point of the swing.
To find Jake's velocity at the lowest point, we can use the formula for kinetic energy:
KE = (1/2)mv²
where v is velocity. Rearranging the formula to solve for v, we get:
v = √((2KE)/m)
Substituting in the values, we get:
v = √((2(392 J))/(20 kg)) = 7.0 m/s
This is Jake's velocity at the lowest point of the swing.
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Learning Goal: To understand the meaning of the variables that appear in the equations for one-dimensional kinematics with constant acceleration.Motion with a constant, nonzero acceleration is not uncommon in the world around us. Falling (or threwn) objects and cars starting and stopping approximate this type of motion It is also the type of motion most frequently involved in introductory kinematics problems The kinematic equations for such motion can be written as z(t) = x + vt + at^2 v(t) = 1+ at where the symbols are defined as follows .A. X(t) is the position of the particle is the initial position of the particle . B. x(i) is the velocity of the particleC. v(t) is the initial velocity of the particle D. Vi is the acceleration of the particle
The variables in the kinematic equations for motion in one dimension with constant acceleration are time, initial position, initial velocity, initial acceleration, velocity, and position.
The following are accurate definitions for the variables in the kinematic equations for motion in one dimension with constant acceleration:
A. x(t) represents the particle's position at time t as determined by its initial position x. (0).
B. v(t) represents the particle's speed at time t as determined by its initial speed v. (0).
C. The particle's starting position, or the position at time t=0, is represented by the number x(0).
D. The initial velocity of the particle, or its speed at time t=0, is known as v(0).
E. an is the particle's constant acceleration.
It's vital to remember that the x and v subscripts denote the time at which the location or velocity is being measured. As an illustration, x(0) is the particle's position at time.
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A GPS satellite orbits at an altitude of 20,200 km above the surface of the earth. What is the speed of the satellite? Recall that RE= 6.37 x 10^6 m
The speed of the GPS satellite can be calculated using the following formula:
How to calculate GPS satellite ?v = √(GM/r)
where G is the gravitational constant, M is the mass of the Earth, r is the distance between the center of the Earth and the satellite, and v is the speed of the satellite.The distance between the satellite and the center of the Earth can be found by adding the radius of the Earth to the altitude of the satellite:r = RE + h = 6.37 x 10^6 m + 20,200,000 m = 2.06 x 10^7 m
The mass of the Earth is M = 5.97 x 10^24 kg, and the gravitational constant is G = 6.67 x 10^-11 Nm^2/kg^2. Substituting these values into the formula, we get:v = √(GM/r) = √((6.67 x 10^-11 Nm^2/kg^2)(5.97 x 10^24 kg)/(2.06 x 10^7 m)) ≈ 3,870 m/s
Therefore, the speed of the GPS satellite is approximately 3,870 m/s.
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compute the initial upward acceleration of a rocket of mass 1.80 x 104 kg if the initial upward force produced by its engine (the thrust) is 4.60 x 105 n. do not neglect the gravitational force on the rocket.
The initial upward acceleration of the rocket is 15.75 m/s. The result is obtained using Newton's second law.
How to find the acceleration of a rocket?A rocket with a mass of 1.80 × 10⁴ kg is moving upward. The initial upward force produced by its engine (the thrust) is 4.60 × 10 N.
Find the initial upward acceleration without neglecting the gravitational force on the rocket!
We have
m = 1.80 × 10⁴ kgF = 4.60 × 10⁵ NWhen the rocket moves upward, the acceleration can be found by Newton's second law equation.
F = ma
Without neglecting the gravitational force in the opposite direction, it will be
F - W = ma
F - mg = ma
With g = 9.8 m/s², the initial upward acceleration is
ma = F - mg
1.80 × 10⁴a = 4.60 × 10⁵ - 1.80 × 10⁴ × 9.8
1.80 × 10⁴a = 4.60 × 10⁵ - 1.764 × 10⁵
1.80 × 10⁴a = 2.836 × 10⁵
a = 1.575 × 10¹
a = 15.75 m/s
Hence, the rocket's initial upward acceleration is 15.75 m/s.
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How do you find the VM the muzzle velocity of the ball?
The muzzle velocity (VM) of a ball can be found by using a ballistic pendulum.
The basic principle of a ballistic pendulum is that the momentum of the ball before it hits the pendulum equals the momentum of the pendulum and the ball immediately after the collision.
The equation for this is
[tex]m_1v_1 = (m_1 + m_2) v_2[/tex]
, where m₁ is the mass of the ball, v₁ is the initial velocity of the ball, m₂ is the mass of the pendulum, and v₂ is the velocity of the pendulum and the ball immediately after the collision.
Solving for v₁, we get
[tex]VM = v_1 = (m_1 + m_2) \dfrac{v_2}{m_1}[/tex]
By measuring the height to which the pendulum rises and the mass of the pendulum, we can determine the velocity of the ball.
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Lake Erie is prone to remarkable seiches-standing waves that slosh water back and forth in the lake basin from the west end at Toledo to the east end at Buffalo. The figure shows smoothed data for the displacement from normal water levels along the lake at the high point of one particular seiche. 3 hours later the water was at normal levels throughout the basin; 6 hours later the water was high in Toledo and low in Buffalo.
the Wavelength is 800 km
What is the frequency and wave speed?
The frequency and wave speed after the water was high in Toledo and low in Buffalo is 2.3 * 10^-5 Hz and 18 m/s
Period = 12 hours
= 43,200 seconds.
The number of cycles or vibrations that a body in periodic motion experiences during one unit of time, as well as the number of waves that pass a fixed point in a unit of time. After moving through a series of situations or positions and then returning to its initial position, a body in periodic motion is said to have experienced one cycle or one vibration.
Frequency= 1/T
= 1/43200
= 2.3 * 10^-5 Hz
The amount of space a wave covers in a certain amount of time, such as the number of metres it covers in a second, is known as its wave speed. Speed = Wavelength x Frequency is an equation that describes how wave speed relates to wave wavelength and wave frequency. When the wavelength and frequency are known, this equation can be used to determine the wave speed.
Wave speed
= wavelength*(1/period)
= wavelength*frequency
= 800,000 m * 2.3 * 10^-5 Hz
= 18 m/s
Therefore, wave speed of the water be 18 m/s.
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What will happen to an acceleration if the mass of an object is tripled, but the force is kept the same?
If the mass of an object is tripled while the force acting upon it is kept constant, the acceleration of the object will be reduced to one-third of its original value.
This can be explained using Newton's second law of motion, which states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass.
In this scenario, the force is held constant, but the mass is increased by a factor of three. As a result, the acceleration will decrease by a factor of three, since the same force is now acting on a much heavier object. Therefore, the object will experience a lower acceleration than before, making it harder to move or change its speed or direction.
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What two processes are part of electromagnetism?
A. The attraction of electric charges for each other
B. The production of a magnetic field by an electric current
C. The production of an electric current by a moving magnet
D. The production of a magnetic field by permanent magnets
Answer:
C. The production of an electric current by a moving magnet
B. The production of a magnetic field by an electric current
What is electromagnetism?
The " real definition " of electromagnetism is the following:
Electromagnetism is the physical interaction among electric charges, magnetic moments, and the electromagnetic field.
There are different " types " of electromagnetic fields
StaticSlowly changingWavesThe last thing that YOU should know is that electromagnetic waves are generally known as light and obey the laws of optics. Which means in similar terms they just obey the laws of optics.
Thus, the answers to your question is, C & B
Two negatively-charged objects are located on the x axis, equally distant from the origin as shown. Consider the electric field at the point P1. How will that electric field change if a third object with a charge +q is placed at point P2? Note: the point P2 is the same distance from the origin as the point P1 and the magnitude of each of the charges is the same.a) The magnitude of the electric field will decrease by 25%.b) The magnitude of the electric field will increase by 25%.c) The magnitude of the electric field will decrease by 50%.d) The magnitude of the electric field will increase by 50%. e) The magnitude of the electric field will increase by 100%.
Electric field change if a third object with a charge +q is placed at point P2 is the magnitude of the electric field will decrease by 25%.
Electric field is a vector quantity. It has a direction towards the negative charge and away from a positive charge.
Due to the 2 negatice charges, electric field E's verticle component will add up and horizontal component will cancel each other.
Electric field due to a charge particle = K q / r^2
K = constant
q = charge
r = distance of the point from the charge
Angle made by electric field = 45 degrees
Verticle component of the electric field due to two -q = E =2 * K(-q) cos 45 / (V2 R)^2 \
= -V2 Kq/2R^2 = -0.71 Kq/R^2
New electric field after a charge +q is introduced = initial E + E due to +q
E due to +q = Kq / (2R)^2 = 0.25 Kq/R^2
Percentage Change in electric field = (Change in electric field / Initial electric field) * 100 = 0.25 *100 / -0.71 = -25%.
Therefore, the magnitude of the electric field will decrease by 25%.
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use your function to predict the force on the force sensor when the ramp angle is 90 degrees. to make your prediction, assume a cart mass of 2.25 kg.
When the angle is 90 degrees up, the only force acting in a downward direction is gravitational force, with magnitude mg, where m is mass and g is gravitational acceleration.
m = 2.25 kg, g = 9.8 /s²
F = mg = 2.25 × 9.8
F = 22.05 N.
An item falling freely in a vacuum is said to accelerate gravitationally in physics. This is the constant acceleration brought on just by the gravitational pull.
By putting an object in a vacuum chamber and monitoring the object's speed as a function of time as it accelerates, one can calculate the gravitational acceleration. This is the approach that Galileo popularized.
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57. You are driving through town at 12 m/s when suddenly a ball rolls out in front of you. You apply the brakes and begin decelerating at 3.5 m/s2. (a) how far do you travel before stopping? (b) When you have traveled only half the distance in part a, is your speed 6.0 m/s, greater than 6 m/s or less than 6 m/s? Support your answer with calculations.
a) Travelled 20.57 meters before coming to a stop.
b) When travelled half the distance, the speed is 2.6 m/s, which is less than 6 m/s.
What does speed mean?Speed is a measure of how fast an object is moving, without regard to the direction of its motion. It is defined as the distance travelled by an object per unit of time. Speed is a scalar quantity, which means it only has magnitude (i.e., numerical value) and not direction. The standard unit of speed is meters per second (m/s) in the International System of Units (SI), although other units such as kilometres per hour (km/h) and miles per hour (mph) are also commonly used. It can be calculated as the ratio of distance traveled by an object to the time taken to cover that distance.
For example, if a car travels 100 meters in 10 seconds, its speed can be calculated as 100 meters divided by 10 seconds, which equals 10 meters per second. Speed can also be constant, if the object is moving at a constant rate without changing its speed, or variable, if the object's speed changes over time.
(a) To determine how far travelled before stopping, use the kinematic equation:
[tex]v^2 = u^2 + 2as[/tex]
where,
v = final velocity (0 m/s, since you come to a stop)
u = initial velocity (12 m/s)
a = acceleration (-3.5 m/s^2, since decelerating)
s = distance traveled (unknown)
Rearranging the equation to solve for s, we get:
[tex]s = (v^2 - u^2) / (2a)[/tex]
Substituting in the known values, we get:
[tex]s = (0 - (12 m/s)^2) / (2*(-3.5 m/s^2)) = 20.57 m[/tex]
Therefore, travelled 20.57 meters before coming to a stop.
(b) To determine speed, travelled half the distance, use the kinematic equation:
[tex]s = ut + 0.5at^2[/tex]
where,
t = time elapsed (unknown, but use the fact that have travelled half the distance)
s = distance traveled (half of 20.57 m = 10.285 m)
u = initial velocity (12 m/s)
a = acceleration (-3.5 m/s^2)
Substituting the known values,
[tex]10.285 m = (12 m/s)t + 0.5(-3.5 m/s^2)t^2[/tex]
Simplifying and rearranging, a quadratic equation is obtained:
[tex]1.75t^2 - 12t + 10.285 = 0[/tex]
Solving t using the quadratic formula,
t = 2.52 s (rounded to two decimal places)
Now, to find your speed at this point, we can use the kinematic equation:
[tex]v = u + at[/tex]
Substituting the known values,
[tex]v = 12 m/s + (-3.5 m/s^2)(2.52 s) = 2.6 m/s[/tex]
Therefore, when travelled half the distance, the speed is 2.6 m/s, which is less than 6 m/s.
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show that for every k, there is a set of k positive integers such that the difference of any two of these has an even number of prime factors, counted with multiplicity. (hint: you don't need to know any number theory.)
It is demonstrated that for each k, there exists a set of k positive integers whose difference has an even number of prime components, counted with multiplicity.
Let's construct the set of positive integers using the following algorithm:
Start with the first k prime numbers: 2, 3, 5, 7, 11, ..., p_k.
Define the i-th integer in the set as the product of the first i prime numbers: a_i = 235*...*p_i.
Claim: For any two integers in the set, their difference has an even number of prime factors, counted with multiplicity.
Proof:
Let a_i and a_j be two integers in the set such that i < j. We want to show that the difference a_j - a_i has an even number of prime factors, counted with multiplicity.
Notice that a_j - a_i can be written as:
a_j - a_i = 235*...p_i(235*...*p_j/2 - 1)
The first term on the right-hand side has i prime factors, and the second term has an odd number of prime factors. To see why the second term has an odd number of prime factors, notice that all the prime factors of 235*...p_j are also prime factors of 235...*p_i, so they cancel out in the difference.
a_j - a_i has i prime factors plus an odd number of prime factors, which is an even number of prime factors. This completes the proof.
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A metallic surface is illuminated by light. There is another metal plate a few cm away, which is held at an electric potential of V the plate is connected to a circuit which measures the current of electrons. When light of wavelength 520 nm is incident on the metal surface, electrons are emitted from the metal surface and absorbed by the second plate, which creates a current. When the potential of the second plate V is increased to Vstop =0.3 V, the current stops. 3.1 Photon energyWhat is the energy of each photon in electron volts?
The energy of each photon in electron volts is, 2.07.
Stopping potential is the minimum negative voltage applied to the anode to stop the photocurrent. The maximum kinetic energy of the electrons equal the stopping voltage, when measured in electron volt.
Stopping potential = Energy of light wave falling - energy of each photon
Energy of light wave falling = [tex]\dfrac{hc}{\lambda}[/tex]
Energy of light wave falling = [tex]\dfrac{hc}{\lambda}[/tex]
Energy in electron volts for a wave of wavelength 520 nm is, 2.37 eV.
Now,
Stopping potential = Energy of light wave falling - energy of each photon
0.3V = 2.37 - energy of each photon
Energy of each photon = 2.07
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Adam lifts a book from the floor, carries it across the room, and places it on a high shelf. When is Adam doing work on the book?
W= FD
Work = Force x Distance
A. He does work from the moment he touches the book until he lets it go.
B. He does work only while he carries the book across the room.
C. He does work on the book at no time during this process.
D. He does work as he picks up the book and as he lifts it to the shelf.
Adam lifts a book from the floor, carries it across the room, and places it on a high shelf, he does work only while he carries the book across the room, which is in option B, as work = force x distance.
What is the work done by a person?According to the equation for work (W = FD), work is only done when a force is applied to an object and it moves some distance as a result of that force, when Adam lifts the book from the floor, he applies force to it, but the book does not move any distance, so no work is done when the object doesn't move, but when he moved the book, work was done.
Hence, he does work only while he carries the book across the room, which is in option B, as he lifts a book from the floor and carries it across the room.
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When a weak stimulus is applied in rapid succession, it will often reach threshold due to
spatial summation.
excitatory summation.
voltage potential.
inhibitory summation.
temporal summation.
When a weak stimulus is applied in rapid succession, it will often reach threshold due to Temporal summation.
What is a stimulus ?Stimulus is the effect that cause a change in the external or internal environment which brings physiological responses.
Here,
The weak stimulus applied is converted into a large signal so that it could reach the threshold.
Temporal summation is the phenomenon that could convert a series of weak stimuli at a specific frequency into a large signal and to achieve action potential.
Hence,
When a weak stimulus is applied in rapid succession, it will often reach threshold due to Temporal summation.
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7. A 1,2 kg hammer is used to hit a nail horizontally into a block of wood. The hammer is moving at 15 m.s¹ immediately before it collides with the nail and rebounds at 60% of that speed. The nail's resisting force is 9 000 N. Calculate how long the hammer is in contact with the nail.
Answer:
ETo calculate the duration of the hammer's collision with the nail, we need to find the time it takes for the hammer to come to a stop and then reverse direction.
The hammer's initial momentum before the collision is given by its mass and velocity:
p_i = m * v_i = 1.2 kg * 15 m/s = 18 kg m/s
The hammer's final velocity after the collision can be found using the law of conservation of momentum, which states that the total momentum of an isolated system remains constant. We can write this as:
p_f = m * v_f = m * (-v_i * 0.6) = m * (-15 m/s * 0.6) = 9 kg m/s
The force experienced by the nail during the collision can be calculated as:
F = ma = (m * (v_f - v_i)) / t = (m * (9 kg m/s - 18 kg m/s)) / t
Since we know the force experienced by the nail is 9 000 N, we can use this to solve for t:
9 000 N = (1.2 kg * (9 kg m/s - 18 kg m/s)) / t
t = (1.2 kg * (9 kg m/s - 18 kg m/s)) / 9000 N
t = 0.00133 seconds
So the hammer is in contact with the nail for approximately 0.00133 seconds.
variable:
m: mass of the hammer, 1.2 kg
v_i: initial velocity of the hammer before the collision, 15 m/s
v_f: final velocity of the hammer after the collision, -9 m/s (negative sign indicates the direction of motion is opposite to the initial velocity)
t: duration of the hammer's collision with the nail, approximately 0
A hot rod can accelerate from 0 to 60 km/h in 7.5 s. (a) What is its average acceleration, in m/s2, during this time? (b) How far will it travel during the 7.5 s, assuming its acceleration is constant? (c) From rest, how much time would it require to go a distance of 0.40 km if its acceleration could be maintained at the value in (a)?
Average acceleration is a) 2.22 [tex]m/s^2[/tex] b) hot rod travels 78.4 m c) time is 20 seconds
(a) To find the average acceleration, we need to use the formula: average acceleration = change in velocity / time.
First, we convert 60 km/h to m/s:
60 km/h x 1000 m/km x 1 h/3600 s = 16.67 m/s
So the change in velocity is:
16.67 m/s - 0 m/s = 16.67 m/s
And the time is:
7.5 s
Therefore, the average acceleration is:
average acceleration = (16.67 m/s) / (7.5 s) = 2.22 m/s^2
(b) To find the distance traveled, we can use the formula: distance = initial velocity x time + 0.5 x acceleration x time^2.
The initial velocity is 0 m/s, so the formula becomes:
distance = 0.5 x acceleration x time^2
Plugging in the values, we get:
distance = 0.5 x 2.22 m/s^2 x (7.5 s)^2 = 78.4 m
Therefore, the hot rod will travel 78.4 meters during the 7.5 seconds.
(c) We can use the formula: distance = 0.5 x acceleration x time^2, and solve for time.
Plugging in the values, we get:
0.40 km x 1000 m/km = 400 m
acceleration = 2.22 m/s^2
So the formula becomes:
400 m = 0.5 x 2.22 m/s^2 x time^2
Solving for time, we get:
time = sqrt(400 m / (0.5 x 2.22 m/s^2)) = 20 s
Therefore, it would take 20 seconds for the hot rod to travel 0.40 km with constant acceleration of 2.22 m/s^2.
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in short-track speed skating, the track has straight sections and semicircles 16 min diameter. assume that a 68 kgskater goes around the turn at a constant 12 m/s.(figure 1)
The track in relatively brief speed skating has straight stretches and semicircles with a 16-minute diameter. This 68 kg skate makes the maneuver at a steady 12 m/s while exerting 1224 N.
What is speed and what is its unit in physics?The pace at which a distance changes over time is referred to as speed. It has a dimension of time-distance. As a consequence, the fundamental unit of time as well as the basic measure of distances are combined to form the Special name of speed. Thus, the meter per second (m/s) is the Unit of measure of speed.
r = 8 m.
tangential velocity = 12 m/s.
angular speed is,
ω = v/r
= (12 m/s)/(8 m)
= 1.5 rad/s
centripetal acceleration,
a = r*ω²
= (8 m)*(1.5 rad/s)²
= 18 m/s².
force,
F = m*a
= (68 kg)*(18 m/s²)
= 1224 N
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a - ladder leans against the side of a house. the bottom of the ladder is from the side of the house. how high is the top of the ladder from the ground? if necessary, round your answer to the nearest tenth.
The top of the 12 ft ladder that leans against the house, and the bottom of the ladder is 9 ft from the side of the house = 7.9 ft
The triangle formed by the ladder must be a right angle with a hypotenuse (Side opposite to right angle) of 12 feet since the side of the house must be vertical to the ground to form a right angle.
Let x represent how high the ladder's top is above the ground.
We have the following using the Pythagoras theorem of right triangles:
c² = a² + b²
12² = 9² + x²
x² = 144 - 81
= 63
Hence,
x = √63
= 7.9 ft
The question is incomplete, it should be:
A 12 - ft ladder leans against the side of a house. the bottom of the ladder is 9 ft from the side of the house. how high is the top of the ladder from the ground? if necessary, round your answer to the nearest tenth.
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A bolt is dropped from a bridge under construction, falling 95 m to the valley below the bridge. (a) How much time does it take to pass
through the last 30 % of its fall? What is its speed (b) when it begins that last 30 % of its fall and (c) just before it reaches the ground?
(a) 0.72
(b) ?
(c) ?
The bolt's initial velocity, V, is zero when it is released from the container at a height of 94 meters.
A height of 0.26*94 = 24.4 m marks the final 26% of its descent.
By then, the bolt had dropped 94 - 24.4 = 69.56 m.
The last 26% of the bolt's fall takes 0.6122 seconds to complete.
(b) The bolt travels at a speed of 36.92 m/s for the final 26% of its descent (nearest hundredth).
(c) The bolt's speed is 42.94 m/s just before it touches the earth (nearest hundredth).
When does acceleration differ from velocity?The change in displacement is measured in terms of velocity. The rate of velocity that changes is known termed accelerated. Due to the magnitude it contains, velocity is a vector quantity.
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Read the following paragraph and answer the question. "Ernest Cline is an American Screenwriter and author. Ernest was born in 1972. He started his writing career in 1992
doing spoken word poetry. His best known works include 'Dance Monkey Dance' and 'When I Was a Kid. He then moved to film, as the screenwriter of the film Fanboys. He then released one of the most entertaining novels of all time, Ready Player One. Today Cline is still working, writing for many projects." What is the structure of this paragraph?
A. Causeleffect
B. Sequence
C. Problem/solution
D. Comparison
The structure of the given paragraph about Ernest Cline is sequence writing.
The correct option is B.
What is sequence writing?Writing that organizes information or events in a certain order is known as sequence writing. In order for the reader to understand and follow the flow of events, sequence writing aims to convey information or events in a straightforward and logical manner.
For instance, the phases in a procedure are described sequentially in instructional writing to aid the reader in comprehending how to carry out a task. Events in narratives are presented chronologically to make it easier for the reader to follow the plot.
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