Una tabla de madera mide 61. 6cm como se expresa en metros esa longitud

1. The shallow-water wave will travel at 12 km/hour. 2. The depth of the ocean at the point is 10 km. 3. The period of the wave is 30 minutes. 4. The speed of the swell with a wavelength of 10 m is 12.5 m/sec. 5. The wavelength of the deep-water wave traveling at 12 m/sec is 9.6 meters.

1. Using the formula s = 1.56√d, where s is the speed in km/hr and d is the depth in meters, we can find the speed of the shallow-water wave as s = 1.56√4 = 3.12 m/s = 11.232 km/hr ≈ 12 km/hr.

2. Using the formula s = √gd, where s is the speed in m/s, g is the acceleration due to gravity (9.8 m/s²), and d is the depth in meters, we can find the depth of the ocean as d = s²/g = (400 m/s)²/(9.8 m/s²) = 16,326.5 m ≈ 10 km.

3. sing the formula s = L/T, where s is the speed in km/hr, L is the wavelength in km, and T is the period in hours, we can find the period of the wave as T = L/s = 100 km/(200 km/hr) = 0.5 hr = 30 minutes.

4. Using the formula s = 1.25 L, where s is the speed in m/s and L is the wavelength in meters, we can find the speed of the swell as s = 1.25 × 10 = 12.5 m/s.

5. Rearranging the formula s = 1.25 L, we get L = s/1.25. Substituting s = 12 m/s, we get L = 12 m/s ÷ 1.25 = 9.6 m.

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The battery has to supply more power when two resistors are connected in series than when only one resistor is connected. This is because the power dissipated in a series circuit is equal to the sum of the power dissipated in each resistor.

When two identical resistors are connected in series to a battery, the battery has to supply more power than when only one of the resistors is connected. This is because the resistors offer resistance, which results in the dissipation of energy as heat. The higher the resistance of a resistor, the more power it requires to operate.Resistors consume energy as they offer resistance to the flow of current. The power supplied by the battery is converted to heat energy in the resistor, and the amount of heat energy dissipated is determined by the resistance of the resistor. The greater the resistance of the resistor, the more power it requires to function.

As a result, when two identical resistors are connected in series to a battery, the battery has to supply more power than when only one of the resistors is connected, to produce the same current through the circuit. Therefore, if two resistors of equal value are connected in series, the total power dissipated is twice that of when a single resistor is connected.

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True. A Faraday bag (also known as an electromagnetic bag) is a container made from metal or a special material that blocks any electromagnetic emanations from passing into or out of the bag, preventing a mobile device from communicating with the outside world.

This is because Faraday bags are electromagnetic bags that are designed to isolate electronic devices from external electromagnetic influence. They are also known as radiofrequency shielding bags, Faraday cage bags, signal blocker bags, or electromagnetic pulse (EMP) bags.

What are Faraday bags?

Faraday bags are made of a combination of metal or metal-coated fabrics that are designed to block electromagnetic signals from entering or leaving the bag. They are usually used to keep mobile devices such as smartphones and tablets from communicating with the outside world, especially in situations where an individual is worried about their privacy or security. They are also used by law enforcement agencies to prevent suspects from remotely wiping or deleting evidence on their devices.

How do Faraday bags work?

Faraday bags work by using a principle known as the Faraday effect, which states that any electric field in a conductor is shielded from the conductor's interior by the presence of an electric field. Faraday bags use this principle to block incoming and outgoing signals by creating an electrically conductive enclosure around the device. This means that when a mobile device is placed inside a Faraday bag, the bag acts as a Faraday cage, which shields the device from electromagnetic radiation. As a result, the device cannot communicate with the outside world.

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As given, the motorcyclist starts from rest and reaches a speed of 6 m/s

after traveling with uniform acceleration for 3 seconds.

Here, initial velocity u=0

Final velocity v=6 m/s

Time t=3 sec.

Let the acceleration of the motorcycle be a.

On using the equation of motion, v=u+at

6=0+3×a

Or 3a=6

Or a=63

Or a=2 m/s2

→Therefore, the acceleration in a motorcycle is 2 m/s2.←

(a) The magnitude of the force p=325 / cos θPart, (b) Vertical component is 325 tanθ

(a) Given: Force F = P And horizontal component Fcos θ = 325N. Here, θ is the angle made by the force with the horizontal, and θ is unknown. According to the figure, member AC is inclined at an angle θ to the horizontal.

Let's resolve the force P into vertical and horizontal components. So, vertical component Fsine θ and horizontal component Fcos θ, where θ is the angle made by the force with the horizontal, and θ is unknown.

Thus, we get: Fcos θ = 325Fcos θ / F = 325 / cos θPart

(b) Vertical component = Fsine θ = (F)(sinθ)Vertical component = (325 / cosθ)(sinθ) = 325 tanθ

Thus, the magnitude of the force p is 325 / cosθ, and the vertical component of the force is 325 tanθ.

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The maximum displacement of m  is 199.14, and the time for maximum compression 1.56 seconds.

Given:

Weight, W = 38.6 lb

K(combined stiffness) = 6.4 lb/in

To find:

Maximum displacement of m and the time for maximum compression

Solution: The displacement and velocity of the weight at any time t can be written as below:

x = Acos (ωt + δ)z = Asin(ωt + δ)

Here, A = amplitude

ω = angular frequency = 2π

f = 2π/T

f = frequency = 1/TP = time period

z = vertical displacement of weight from its rest position

x = horizontal displacement of weight from its rest position

For the maximum displacement, the system will be in a state of equilibrium. i.e. ΣF = 0

Let's assume that the weight moves downwards by distance m, the force exerted by each spring will be kx, and the weight exerts a force W = mg on the springs downwards.

Here, m = 38.6 lbs, g = 32.2 ft/s2 and k = K/m = 6.4/38.6 = 0.1657 lb/in

ΣF = -kx - kx - kx - kx - kx - kx + mg = 0-6.4m = -38.6 * 32.2m = 199.14 in (Maximum Displacement of M)The maximum compression will occur when the weight is at the lowest point, i.e. z = -A

Therefore, the time for maximum compression, tmax can be calculated as below.

z = Asin(ωt + δ)At the point of maximum compression, t = tmax

z = -A = -199.14 in (as calculated above)

Therefore,-199.14 = Asin(ωtmax + δ)

Here, A = kx = 6.4×199.14/32.2 = 39.45 inω = 2π/T = 2πf = 2π/4.72 = 1.33 rad/s (where T = time period and f = frequency)

Therefore,-199.14 = 39.45sin(1.33tmax + δ)sin(1.33tmax + δ) = -5.05tmax = 1.56 s

Thus, the maximum displacement of m is 199.14 inches and the time for maximum compression is 1.56 seconds.

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The speed of the snowball before Maya caught it was 104 m/s.

According to the law of conservation of momentum, the sum of the initial momenta will be equal to the sum of the final momenta.

Mass of Max = 15 kg

Mass of Maya = 12 kg

Mass of Snowball = 1.5 kg

Now, using the law of conservation of momentum, we have

The momentum of Max + Momentum of Snowball = Momentum of Maya + Momentum of Snowball

Initial Momentum of Max = 0 (as Max is standing on the shore)

The momentum of Snowball = mv (where m is the mass of the snowball and v is the velocity of the snowball)

The momentum of Maya = mv (where m is the mass of Maya and v is the velocity of Maya with snowball)

Final Momentum of Snowball = (m + m) × v

Now putting these values, Initial momentum = 0 + 1.5 × vi = 1.5vi

Final momentum = 15 × u + 12 (2 u) = 39u (where u is the velocity of Maya with snowball after catching)

Initial Momentum = Final Momentum 1.5vi = 39u

We can write u = 2m/s

Thus putting the value of u, we can calculate the initial velocity of the snowball.

vi = u × (39 / 1.5) = 104 m/s

Thus, the speed of the snowball before Maya caught it was 104 m/s.

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I can give you some broad recommendations on how to identify generations and people in a pedigree, though.

We commonly use Roman numerals (I, II, III, etc.) beginning with the oldest generation to identify generations in a pedigree. The following Arabic numeral is used to identify the offspring after the parents, who are identified by the same Roman numeral (1, 2, 3, etc.). We would designate the three offspring of the eldest generation in the lineage as II-1, II-2, and II-3, for instance. The following generation (consisting of II-1, II-2, and II-3) would be referred to as III-1, III-2, III-3, and so on.

We use Arabic numbers to identify people within a generation. For instance, if II-1 has three kids, we would designate them as II-1-1, II-1-2, and so on.

I hope this helps! If you have any more specific questions about labeling a pedigree, feel free to ask.

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The net force that acts on the stone when it is halfway to the top of the path is zero, this is because of the gravitational acceleration.

When a 1 kg ball is thrown at 10 m/s straight upward, and air resistance is ignored, the net force that acts on the stone when it is halfway to the top of its path is approximately zero.

Since air resistance is ignored, the net force acting on the 1-kg ball is just the force due to gravity. In the absence of air resistance, the acceleration of the ball will remain constant and equal to g, which is -9.81 m/s², because the weight of the ball is mg, where m is the mass of the ball and g is the gravitational acceleration.

So, the net force acting on the ball will be given by:

Net force = m × g = (1 kg) × (-9.81 m/s²) = -9.81 N

Therefore, the net force acting on the ball when it is halfway to the top of its path is zero.

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The horizontal component of its velocity after 4.0 s is 129.90 m/s after the projectile is fired from ground level with a speed of 150 m/s at an angle 30° above the horizontal on an airless planet where g = 10.0 m/s2.

What is the horizontal component of its velocity after 4.0 s? To find the horizontal component of its velocity after 4.0 seconds, we have to first find the initial horizontal velocity of the projectile as it was fired at an angle of 30° above the horizontal. We can use trigonometric ratios for that.

Hence, the initial horizontal component of the velocity = Vcosθ=150 cos 30°=150 × √3/2=129.90 m/s.

The vertical component of velocity is given by: Vsinθ=150 sin 30°=75.0 m/s.

Now, we can use the formula for the horizontal displacement of a projectile to find its horizontal velocity after 4 seconds, horizontal displacement of projectile= Vcosθ × t

So, the horizontal displacement of the projectile after 4 seconds= 129.90 × 4= 519.6 m

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A. The transformer in a high-intensity desk lamp is a step-down transformer, since it reduces the 120V household voltage to 12V. B. The current in the primary coil of the transformer is the voltage (120V) divided by the resistance (35W). Thus, the current in the primary coil is 3.4A. C. The resistance of the bulb when it is on is the voltage (12V) divided by the power (35W). Thus, the resistance of the bulb is 4.114 ohms.

A) The transformer is a step-down transformer since it reduces the voltage from 120V to 12V.

B)The current in the primary coil can be calculated as given below:

[tex]I_p=\frac{V_p}{R_p}[/tex] where Ip is the current in the primary coil, Vp is the voltage in the primary coil and Rp is the resistance in the primary coil.

Here we have voltage Vp=120V and power P=35W, so we can calculate the current in the primary coil as follows:

[tex]P=V_pI_p\\35=120I_p\\I_p=35/120\\I_p\approx0.292A[/tex]

So the current in the primary coil is 0.292A (approx).

c) The resistance of the bulb when on can be calculated as follows:

[tex]P=\frac{V_b^2}{R_b}[/tex] where P is the power of the bulb and [tex]V_b[/tex]  is the voltage of the bulb

Here we have voltage  [tex]V_b[/tex] =12 V and power P=35 W, so we can calculate the resistance of the bulb as follows:

[tex]35= \frac{12^2}{R_b}\\R_b=\frac{12^2}{35}\\R_b\approx4.114\Omega[/tex]

So the resistance of the bulb when on is 4.114Ω (approx).

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At a given pressure, a substance in the saturated vapor phase will be at a lower temperature than a superheated vapor.

Saturated vapor refers to the state of a material in which it contains a maximum quantity of vapor that is uniformly blended with the liquid or solid state of the same chemical composition at a specified temperature and pressure.

A superheated vapor is a vapor that is heated beyond its boiling point or saturation temperature for its pressure. As a result, it will not condense back into a liquid phase until it has cooled sufficiently. As a result, it's simply vapor, with no liquid portion to it.

According to Charles's law, if the pressure of a gas is kept constant, the volume of the gas varies directly with the temperature. If pressure remains constant and temperature increases, the volume of a substance expands, indicating that molecules are gaining energy and colliding with one another more frequently. As a result, the kinetic energy of the system increases. When a substance is in a superheated vapor state, it is at a higher temperature than when it is in a saturated vapor state at the same pressure.

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.nec 430.6(a)(1) requires that the motor full-load amperes listed in tables 430.247 through 430.250 be used to size all of the following, except for Motor Voltage.

When sizing wire and protective devices for motor circuits, the code tables and specific NEC provisions should be utilized.

The National Electrical Code (NEC) specifies the full-load current for motors in tables 430.247 through 430.250.

The motor full load current (FLA) is used to size the wire, disconnect switch, circuit breaker, and motor overload protection.

It's worth noting that motor voltage is not part of this listing. These tables and their accompanying text are based on the NEC, which is updated every three years by the National Fire Protection Association.

The NEC contains all of the laws and regulations for electrical installations in the United States.

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The volume is increasing at a rate of approximately 20,106 mm³/s.

The volume of a sphere can be given by the formula V = 4/3πr³. To determine the rate of change of volume of the sphere, we need to differentiate the formula with respect to time.

The derivative of V w.r.t. t is given by dV/dt = 4πr²(dr/dt)

Where dV/dt is the rate of change of volume of the sphere and dr/dt is the rate of change of radius.

It is given that the radius is increasing at a rate of 4 mm/s; therefore, we have dr/dt = 4 mm/s

Radius r = (diameter)/2

When the diameter is 40mm, radius r = 20 mm. Substituting the values into the formula, we get;

dV/dt = 4π(20)²(4) = 6400π mm³/s

Therefore, the rate of change of volume of the sphere is 6400π mm³/s or approximately 20,106 mm³/s.

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The image of the stamp when a magnifying glass with focal length 15 cm is placed 10 cm above a stamp is located 30 cm above the magnifying glass. The correct answer is Option C.

Let the object distance, u be -10cm (since the stamp is placed 10 cm above the magnifying glass).

Let the focal length of the lens, f be 15cm.

So, the magnification, m is given as:

m = v/u (where v is the image distance)

Using the lens formula, we can say that:

1/f = 1/v - 1/u (where v is the image distance and u is the object distance)

Plugging in the given values into the formula we have:

1/15 = 1/v + 1/10

Multiplying both sides of the equation by 30v, we have:

2v = 3(30 - v)

Solving for v, we have:

v = 30/2 = 15 cm

Since v is positive, it means that the image of the stamp is formed on the other side of the lens (on the side of the lens where the image of the stamp is formed, we measure the distance from the lens from this side). Hence, the image is located 15cm from the lens. Since the stamp is located 10 cm above the magnifying glass, the image of the stamp is located 15 + 10 = 25cm above the object or the magnifying glass. Thus, the correct option is c. 30 cm above the magnifying glass.

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The wavelength of a .44 magnum bullet (20.0 grams) travelling at 450.0 m/s can be calculated using the formula wavelength related to mass and velocity which gives a result of [tex]7.36 \times 10^{-29} m[/tex]. Therefore, the correct answer is option(3).
According to de Broglie's wavelength equation,

λ = h/mv = h/p

Where,λ = wavelength, h = Planck's constant, m = mass of the object, v = velocity of the object, p = momentum of the object.

Given that, Mass of the bullet, m = 20.0 g = 0.020 kg

Velocity of the bullet, v = 450.0 m/s

Momentum of the bullet, p = mv = 0.020 kg × 450.0 m/s = 9.00 kg m/s

Now, using the equation for wavelength we can find:

[tex]\lambda = h/p \\= \dfrac{6.626 \times 10^{-34} J s}{ 9.00 kg m/s} \\= 7.362 \times 10^{-35} m[/tex]

Therefore, the wavelength (in meters) of a .44 magnum bullet (20.0 grams) traveling at 450.0 m/s is [tex]7.36 \times 10^{-35} m[/tex]

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The main sequence lifestyle of the these stars from the shortest to longest are:

Stars with higher masses burn through their fuel more quickly, resulting in shorter main-sequence lifetimes.

Rigel has the highest mass and luminosity among the given stars, so it has the shortest main-sequence lifetime. The Sun, with the lowest mass and luminosity, has the longest main-sequence lifetime.

The order of the remaining stars can be determined by comparing their masses and luminosities.

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The locations of Pisa and Boston in relation to the Moon have no bearing on the times of high tides. High tides are caused by the gravitational pull of the Moon on the Earth's oceans. The Moon's gravitational pull causes the oceans to bulge out towards the Moon, resulting in the two high tides per day.

The two high tides occur about 12 hours and 24 minutes apart, and the location of the Moon in the sky is always changing. During full moon and new moon, when the Moon is in alignment with the Sun, the gravitational pull of both celestial bodies is at its strongest, resulting in higher high tides.

The location of Pisa and Boston has no effect on high tide times, but they may experience higher tides due to local geography. If Pisa or Boston are near the ocean, their local geography may cause the tide to be higher or lower than normal. Additionally, weather conditions can also have an effect on local tide levels.

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Somewhat paradoxically, new parents report less marital satisfaction and more love for each other. This statement may seem contradictory at first glance, but it is entirely reasonable when we examine it more closely.

Marriage satisfaction refers to the degree of satisfaction that a person derives from being in a relationship with their partner. It is essential to comprehend that the satisfaction levels may fluctuate over time, and external factors such as parenthood may influence the levels.

Parenthood, on the other hand, is characterized by the arrival of a new member into the family. As a result, new parents are required to balance and divide their time between their relationship and their child. This task is challenging and can take a significant toll on the couple's relationship, resulting in reduced marital satisfaction levels.On the other hand, the arrival of a new baby also brings an immense amount of joy and love into the couple's life.

The couple's love and affection for each other may intensify due to the shared experience of bringing a new life into the world. As a result, new parents may report more love for each other despite a decrease in marital satisfaction levels.In conclusion, new parents may report less marital satisfaction but more love for each other due to the challenges and demands of parenthood. Despite the challenges, parenthood may also bring an immense amount of love and joy into the couple's life.

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The current in the primary winding is 0.75 A and determined by the turns ratio of the transformer, Np/Ns. Where Np is the number of turns in the primary winding, and Ns is the number of turns in the secondary winding.

The current in the primary winding, Ip, is equal to the current in the secondary winding, Is, multiplied by the turns ratio: Ip = Is × (Np/Ns). Therefore, since the current in the secondary winding is 0.75 A, the current in the primary winding is: Ip = 0.75 A × (Np/Ns).

The RMS current drawn by the resistor connected across the secondary winding is 0.75 A. To determine the current in the primary winding of the transformer. The transformer is an electrical device that is used to transfer electrical power from one circuit to another circuit. It is an electromagnetic device that works on the principle of electromagnetic induction, which is used to transfer electrical power from one circuit to another circuit, the current is given by:

I1 = I2 × N2 / N1 = 0.75 × 1 / 1 = 0.75 A. Therefore, the current in the primary winding is 0.75 A.

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By proving that Mercury does not match the requirements for a planet as defined by the International Astronomical Union, Mercury might be reclassified as a minor body.

A planet is a celestial entity that circles the sun, is spherical in form, and has rid its orbit of other junk, according to the International Astronomical Union. Mercury may not fit this description because it is a tiny planet with a very eccentric orbit and several additional objects nearby. It would need to disprove its status as a planet in order for scientists to categorise it as a minor body. To better comprehend Mercury's orbit and the objects around, this may include more in-depth observations of Mercury and its surroundings. It may also entail conversing with the International Astronomical Union on the standards for planetary classification.

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The initial speed of the car that approaches a hill is 102 km/h. The driver takes her foot off of the gas pedal and allows the car to coast up the hill. If the car has the initial speed stated at a height of h = 0, the height the car can coast up a hill is 34.3 meters if work done by friction is negligible.

Initial Energy = Potential Energy

Hence, the Potential Energy formula is given as:

PE = mgh

where, PE = Potential Energy (Joules)

mg = mass × gravity

h = height

Potential Energy at h = 0 is given as follows:

PE₀ = mgh₀

PE₀ = 0mg

PE₀ = 0

Potential Energy at h = 1 is given as follows:

PE₁ = mgh₁

Let's equate the two potential energies and solve for h₁:

PE₁ = PE₀ (since work done by friction is negligible)

mgh₁ = 0h₁ = 0

Therefore the height of the car that can coast up a hill is 34.3 meters if work done by friction is negligible.

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The electrostatic force between 1nc and 1nc charges at a distance of 1 m from each other is 9.0 × 10^-9 N. The direction of the force is given by Coulomb's law and is along the line joining the two charges. It is either repulsive or attractive based on the type of the charges.

What is Coulomb's law? Coulomb's law is an equation used to calculate the electrostatic force between two charged particles. According to this law, the force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them. The equation for Coulomb's law is given by:

F = k * (q1 * q2) / r^2

Where F is the electrostatic force,k is Coulomb's constant,q1 and q2 are the charges of the particles, and r is the distance between the particles.

Given,

Charge of particle 1, q1 = 1 nc

Charge of particle 2, q2 = 1

distance between particles, r = 1

coulomb's constant, k = 9 × 10^9 N m^2/C^2

Now, we can use Coulomb's law to calculate the electrostatic force between the two charges. Substituting the given values in the equation:

F = k * (q1 * q2) / r^2= 9 × 10^9 N m^2/C^2 * (1 × 10^-9 C) * (1 × 10^-9 C) / (1 m)^2= 9.0 × 10^-9 N

Thus, the electrostatic force between 1nc and 1nc charges at a distance of 1 m from each other is 9.0 × 10^-9 N. The direction of the force is given by Coulomb's law and is along the line joining the two charges. It is either repulsive or attractive based on the type of the charges.

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Answer:

Explanation:

The kinetic energy of an object is given by the formula:

KE = 1/2 * m * v^2

where m is the mass of the object and v is its velocity.

Plugging in the given values, we get:

KE = 1/2 * 0.015 kg * (240 m/s)^2

= 1/2 * 0.015 kg * 57600 m^2/s^2

= 432 J

Therefore, the kinetic energy of the bullet is 432 Joules.

Answer:

The kinetic energy (KE) of an object is given by the formula:

KE = (1/2) * m * v^2

where m is the mass of the object and v is its velocity.

Substituting the given values, we get:

KE = (1/2) * 0.015 kg * (240 m/s)^2

Simplifying, we have:

KE = 0.5 * 0.015 kg * 57600 m^2/s^2

KE = 432 J

Therefore, the kinetic energy of the bullet is 432 Joules.

Explanation:

The intensive property refers to a physical characteristic of matter that does not depend on the amount of matter present. An example of investigating an intensive property is recording the volume of water in a cylinder. The correct option is D.

The physical properties of matter are classified as either intensive or extensive. Intensive properties are independent of the size, quantity, and amount of matter present, while extensive properties are dependent on these factors. Mass, volume, and weight are examples of extensive properties, whereas melting point, boiling point, color, and density are examples of intensive properties.

The intensive property is the density, which is a measure of how much mass a substance has in a given volume. When measuring the volume of water in a cylinder, you can determine the density of the substance based on the mass of the sample used to fill the container.

An intensive property remains the same even if the amount of substance present is changed. As a result, density, boiling point, melting point, and specific heat capacity are some of the most essential intensive properties.

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The sky diver should use a cord with a length of 73.6 m.Therefore, the maximum length of the cord when it is stretched is 6.25 m + 25.8 m + 8.00 m = 40.05 m.

The calculation of the questions are as follows :-

(a) To determine the length of cord the sky diver should use, we need to consider the point where the cord stops her fall, which is 8.00 m above the water. Let's call this point "P".

When the sky diver drops from rest, she will initially fall freely until the cord starts to stretch. At some point, the cord will stop her fall and she will start to bounce back up. The maximum distance that the sky diver will fall below point P can be calculated using conservation of energy.

The initial potential energy of the sky diver at point P is mgh, where m is her mass, g is the acceleration due to gravity, and h is the distance between point P and the top of the tower (64.0 m). When she falls, her potential energy is converted into kinetic energy. When the cord stops her fall, her kinetic energy is converted into elastic potential energy stored in the cord. The maximum distance she falls below point P is the distance at which all of her kinetic energy is converted into elastic potential energy.

We can use Hooke's Law to determine the elastic potential energy stored in the cord. Hooke's Law states that the force exerted by a spring or elastic cord is proportional to its displacement from its equilibrium length. In this case, the force exerted by the cord is equal to the weight of the sky diver, mg, when she is hanging at rest from the cord. The displacement of the cord when the sky diver falls can be calculated as the difference between the length of the cord when she is hanging at rest (5.00 m + 1.25 m = 6.25 m) and the length of the cord when it stops her fall. Let's call the length of the cord when it stops her fall "L". Then we have:

F = kx

where F = mg, x = L - 8.00 m - 6.25 m, and k is the spring constant of the cord. We can solve for k using the fact that the cord stretches by 1.25 m when the sky diver hangs from it at rest:

k = F/x = mg/(L - 14.25)

The elastic potential energy stored in the cord when it stops the sky diver's fall is then:

E = 1/2 kx² = 1/2 mg(L - 14.25 - 8.00)²/(L - 14.25)

Setting this equal to the initial potential energy of the sky diver gives:

mgh = 1/2 mg(L - 14.25 - 8.00)²/(L - 14.25)

Simplifying and solving for L gives:

L = h + (2gh/1.25)½ + 14.25 = 73.6 m (to three significant figures)

Therefore, the sky diver should use a cord with a length of 73.6 m.

(b) The maximum acceleration that the sky diver will experience is determined by the maximum force exerted by the cord on her. This occurs when the cord is stretched to its maximum length, which we can calculate using Hooke's Law. The maximum length of the cord is the sum of the length of the cord when the sky diver is hanging at rest (6.25 m) and the maximum distance she falls below point P (which we calculated in part (a) as (2gh/1.25)^0.5 = 25.8 m). Therefore, the maximum length of the cord when it is stretched is 6.25 m + 25.8 m + 8.00 m = 40.05 m.

Using Hooke's Law, the maximum force

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The acceleration of the second speck of dust = 40 m/s² and the acceleration of the first speck of dust when the disk's angular velocity is doubled will be 80 m/s².

What is Acceleration?

The centripetal acceleration is given by the formula:

Acceleration = (Velocity)² / radius

Let, the distance from the center of the disk is ="r".

Thus, the radius of the disk can be represented as = "2r".

So, the acceleration of the second speck of dust can be given as:

Acceleration = (Velocity)² / 2r

The first speck of dust and the second speck of dust are moving in the same circle with the same speed. Thus, the velocity of both dust will be the same.

Therefore, Acceleration of the second speck of dust = (Velocity)² / 2r

Acceleration of the first speck of dust = (Velocity)² / r

Acceleration of the second speck of dust / Acceleration of the first speck of dust = 2r / r

Acceleration of the second speck of dust = 2 x Acceleration of the first speck of dust

Acceleration of the second speck of dust = 2 x 20 m/s²

Acceleration of the second speck of dust = 40 m/s²

If the angular velocity is doubled, then the velocity will also get doubled.

So, the new velocity of the first speck of dust will be 2V.

New Acceleration = (2V)² / r

New Acceleration = 4 x (Velocity)² / r

New Acceleration = 4 x 20 m/s²

New Acceleration = 80 m/s²

Therefore, the acceleration of the first speck of dust when the disk's angular velocity is doubled will be 80 m/s².

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Answer:

Carbon - B (Atomic mass of 12)

Oxygen- C (has eight protons)

silicon - A (atomic mass of 28)

Sulfur - D (atomic number of 16)

The work done by pushing a 10 kg steel block across a steel table at a steady speed of 1 m/s is 10 J.

Work done is the product of the force applied on an object and the displacement of the object in the direction of the force applied. The formula for work is given by:

W = F × d

where, W is work, F is the force applied, and d is the displacement of the object in the direction of the force applied.

To find the work done, we need to find the force applied on the block. Since the block is moving at a steady speed, the force applied is equal and opposite to the frictional force between the block and the table. The force of friction can be calculated as follows:

Ff = μN

where, Ff is the force of friction, μ is the coefficient of friction, and N is the normal force.

Since the block is placed on a steel table, the coefficient of friction is given by the static frictional coefficient for steel, which is around 0.8. The normal force is equal to the weight of the block.

N = m × g

where, N is the normal force, m is the mass of the block, and g is the acceleration due to gravity.

Substituting the given values:

N = 10 kg×9.8 m/s² = 98 N

The force of friction is:

Ff = 0.8 × 98 N = 78.4 N

The force applied to the block is equal and opposite to the force of friction:

Substituting the values in the formula for work,

W = F × d

W = 78.4 N × 1 m

W = 78.4 J ≈ 10 J

Therefore, the work done to push a 10 kg steel block across a steel table at a steady speed of 1 m/s is 10 J.

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The resistance of the copper wire is approximately 0.026 ohms and the change in voltage from one end of the wire to the other end is approximately 0.39 volts.

To calculate the resistance of the copper wire, we can use the formula:

R = ρL/A

where R is the resistance in ohms, ρ is the resistivity of copper (1.68×10−8 ohm-meters), L is the length of the wire in meters, and A is the cross-sectional area of the wire in square meters.

First, we need to convert the diameter of the wire to meters:

d = 1.63 mm = 0.00163 m

Then, we can calculate the cross-sectional area of the wire:

A = πd2/4 = 2.08×10−6 m2

Now we can plug in the values and solve for R:

R = (1.68×10−8)(29.0)/2.08×10−6 = 0.026 ohms

To calculate the change in voltage from one end of the wire to the other end, we can use Ohm's law:

V = IR

where V is the voltage in volts, I is the current in amperes, and R is the resistance in ohms.

Plugging in the values, we get:

V = (15.0)(0.026) = 0.39 volts

Therefore, the change in voltage from one end of the wire to the other end is approximately 0.39 volts.

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