# a piece of wood is floating in a bathtub. a second piece of wood sits on top of the first piece, and does not touch the water. if the top piece is taken off and placed in the water, what happens to the water level in the tub?

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## Physics Final Exam Flashcards

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## Physics Final Exam

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A jar is completely filled with water, and then it is sealed with a lid. If you push down on the lid with a pressure of 1000 Pa, what happens to the water pressure at the bottom of the jar?

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The water pressure at the bottom of the jar will increase by 1000 Pa.

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A piece of wood is floating in a tub of water. A second piece of wood rest on top of the first piece; it does NOT touch the water. If the second piece is removed from the first and placed in the water, what happens to the water level in the tub?

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The water level remains unchanged.

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### Terms in this set (58)

A jar is completely filled with water, and then it is sealed with a lid. If you push down on the lid with a pressure of 1000 Pa, what happens to the water pressure at the bottom of the jar?

The water pressure at the bottom of the jar will increase by 1000 Pa.

A piece of wood is floating in a tub of water. A second piece of wood rest on top of the first piece; it does NOT touch the water. If the second piece is removed from the first and placed in the water, what happens to the water level in the tub?

The water level remains unchanged.

A cube of wood is floating on water. A cube of iron is totally submerged in water. The cubes are equal in volume. Which cube has the greater buoyant force acting on it?

The cube of iron has the greater buoyant force acting on it.

Water flows through a horizontal pipe. The diameter of the pipe at point B is larger than the diameter of the pipe at point A. Where is the speed of the water the greatest?

The speed of the water is the greatest at point A.

Bernoulli's principle can be used to explain the lift force on an airplane wing. How must an airplane's wing be designed to ensure that Bernoulli's principle is applicable?

Airplane wings must be designed to ensure that air molecules move more rapidly over the top surface of the wing, creating a region of lower pressure.

Water flows through a horizontal pipe. The diameter of the pipe at point B is larger than the diameter of the pipe at point A. Where is the water pressure the greatest?

The water pressure is the greatest at point B.

What term denotes the time for one cycle of a periodic process?

period

For vibrational motion, what term denotes the maximum displacement from the equilibrium position?

amplitude

A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its maximum displacement from equilibrium, what is its instantaneous velocity?

At maximum displacement, its instantaneous velocity is zero.

A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its maximum displacement from equilibrium, what is its instantaneous acceleration?

At maximum displacement, its instantaneous acceleration is also at maximum.

A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, what is its instantaneous velocity?

At equilibrium, its instantaneous velocity is at maximum.

The frequency of a wave increases. If the speed of the wave remains constant, what happens to the distance between successive crests?

The distance between successive crests decreases.

Two wave pulses pass each other on a string. The pulse traveling toward the right has positive amplitude, whereas the pulse traveling toward the left has equal amplitude in the negative direction. What happens when they occupy the same region of space at the same time?

Destructive interference occurs.

A standing wave is established on a string that is fixed at both ends. If the string is vibrating at its fundamental frequency, how is the length of the string related to the wavelength of the standing wave?

The length of the string is equal to one-half of a wavelength.

Which of the following statements are true?

The loudness of a sound is related it its amplitude.

The pitch of a sound is determined by its frequency.

Which temperature scale does NOT have negative values?

Kelvin temperature scale

A flat metal washer is heated. As the washer's temperature increases, what happens to the hole in the center?

The hole in the center of the washer will expand.

What statements are true?

Solid ice is less dense than liquid water. Liquid water expands with increasing temperature above 4°C.

If the pressure acting on a given sample of an ideal gas at constant temperature is tripled, what happens to the volume of the gas?

The volume is reduced to one-third of its original value.

If both the pressure and volume of a given sample of an ideal gas are doubled, what happens to the temperature of the gas in Kelvins?

The temperature of the gas is increased by four times its original value.

Water is in which phase when the pressure is 0.01 atm and the temperature is 90 ∘C?

vapor

Water is in which phase when the pressure is 0.01 atm and the temperature is −20∘C?

solid

A thermally isolated system consists of a hot piece of aluminum and a cold piece of copper. The aluminum and the copper are in thermal contact. The specific heat of aluminum is more than double that of copper. Which object experiences the greater amount of heat transfer during the time it takes the system to reach thermal equilibrium?

## Fluid Mechanics

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## Fluid Mechanics

Fluid Mechanics 41%

1 University Physics

Mohd Amiruddin Abd Rahman

10 months

## 13 Qs

1. Multiple-choice 3 minutes Q.

Pressure in a fluid: Fluid fills the container shown in the figure. At which of the indicated points is the pressure greatest?

answer choices A B C D

The pressure is the same at each of the labeled points.

2. Multiple-choice 3 minutes Q.

Pressure in a fluid: At a certain depth in the ocean, the absolute pressure is p. If you go to twice that depth (treating the water as incompressible)

answer choices

the absolute pressure will be 2p.

the absolute pressure will be less than 2p.

the absolute pressure will be greater than 2p.

the gauge pressure will not change.

the gauge pressure will increase but will not double.

3. Multiple-choice 3 minutes Q.

Buoyancy: Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of salt water displaced by the ship is

answer choices

greater than the volume of fresh water.

less than the volume of fresh water.

the same as the volume of fresh water.

4. Multiple-choice 3 minutes Q.

Buoyancy: A 50-cm3 block of wood is floating partially submerged in water, and a 50-cm3 block of iron is totally submerged in water. Which block has the greater buoyant force on it?

answer choices the wood the iron

Both have the same buoyant force.

The answer cannot be determined without knowing the densities of the blocks.

5. Multiple-choice 3 minutes Q.

Buoyancy: A rock is under water in a shallow lake. As the rock sinks deeper and deeper into water, the buoyant force on it

answer choices increases. decreases remains constant 6. Multiple-choice 3 minutes Q.

Buoyancy: A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?

answer choices It goes up. It goes down. It does not change.

This cannot be determined without knowing the volume of the top piece of wood.

7. Multiple-choice 3 minutes Q.

Flow rate: Water flows through a pipe having a varying width. More water flows per second through the wide section than through the narrow section because there is more room for it to flow.

answer choices True False 8. Multiple-choice 3 minutes Q.

Bernoulli's principle: As the speed of a moving fluid increases, the pressure in the fluid

answer choices increases. remains constant. decreases.

may increase or decrease, depending on the density of the fluid.

9. Multiple-choice 3 minutes Q.

Bernoulli's principle: When you blow some air above the upper face of a paper strip, the paper rises. This occurs because

answer choices

the air above the upper face of the paper moves faster, which makes the pressure higher than at the lower face.

the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face.

the air above the upper face of the paper moves faster but the pressure remains constant.

the air above the upper face of the paper moves slower, which makes the pressure higher than at the lower face.

the air above the upper face of the paper moves slower, which makes the pressure lower than at the lower face.

10. Multiple-choice 3 minutes Q.

Bernoulli's principle: You are driving a late model convertible car at the 65 mph speed limit with its soft flexible roof closed up and the windows closed. You observe that the roof

answer choices bows inward.

is no different from when the car was at rest.

bows outward.

bows inward only when you are driving uphill.

bows inward only when you are driving downhill.

11. Multiple-choice 3 minutes Q.

Density: What is the radius of a sphere that has a density of 5000 kg/m3 and a mass of 6.00 kg?

answer choices 4.98 cm 1.27 cm 6.59 cm 1.56 cm 7.22 cm 12. Multiple-choice 3 minutes Q.

Flow rate: Water is flowing in a horizontal pipe of diameter d. If you want to change the diameter of this pipe so that the speed of the water would be half as great as it was, what should be the new diameter?

answer choices \frac{d}{4} 4 d \frac{d}{2} 2 d \frac{d}{\sqrt{2}} 2 d d\sqrt{2} d 2 2d 2d 13. Multiple-choice 3 minutes Q.

Viscosity: Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%. By what percent would the arterial pressure difference produced by the heart have to be increased to maintain a constant blood flow?

answer choices 48% 52% 50% 46% 54%

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## Answered: piece of iron rests on top of a piece…

Solution for piece of iron rests on top of a piece of wood floating in a bathtub. if the iron is removed from the wood, and kept out of water, what happens to…

Question 100%

a piece of iron rests on top of a piece of wood floating in a bathtub. if the iron is removed from the wood, and kept out of water, what happens to the water level in the tub?

it goes up doesnt change it goes down

it is impossible to determine

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Guys, does anyone know the answer?