Find the average density of a red giant star with a mass of 20 × 1030 kg (approximately 10 solar masses) and a radius of 150 × 109 m (equal to the Earth's distance from the sun).

A) 1.41 × 10−4 kg/m3 B) 0.007 kg/m3 C) 1.41 kg/m3 D) 710 kg/m3 E) 1.41 × 10−3 kg/m3 A) 1.41 × 10−4 kg/m3 B) 0.007 kg/m3 C) 1.41 kg/m3 D) 710 kg/m3 E) 1.41 × 10−3 kg/m3 E

Find the average density of a white dwarf star if it has a mass equal to that of the sun (2.0 × 1030 kg) and a radius equal to that of the Earth (6.4 × 106 m).

A) 9.0 × 106 kg/m3 B) 1.8 × 107 kg/m3 C) 1.8 × 109 kg/m3 D) 3.6 × 1010 kg/m3 E) 9.0 × 107 kg/m3 A) 9.0 × 106 kg/m3 B) 1.8 × 107 kg/m3 C) 1.8 × 109 kg/m3 D) 3.6 × 1010 kg/m3 E) 9.0 × 107 kg/m3

The pressure inside a commercial airliner is maintained at 1 ATM (1.01 × 105 N/m2). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?

A) 1.4 × 102 N B) 1.4 × 103 N C) 1.4 × 104 N D) 1.4 × 105 N E) 7.0 × 103 N A) 1.4 × 102 N B) 1.4 × 103 N C) 1.4 × 104 N D) 1.4 × 105 N E) 7.0 × 103 N

In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 104 N/m and the pressure on the bottom surface is 9.0 × 104 N/m2. If the area of the top and bottom surfaces of each wing is 2.0 m2, what is the total lift on the model airplane?

A) 2.0 × 103 N B) 8.0 × 103 N C) 1.6 × 104 N D) 3.6 × 104 N E) 1.0 × 103 N A) 2.0 × 103 N B) 8.0 × 103 N C) 1.6 × 104 N D) 3.6 × 104 N E) 1.0 × 103 N

Exam 14: Fluid Mechanics

A wind of velocity 10 m/s is blowing through a wind generator with blade radius 5.00 meters. What is the maximum power output if 30.0% of the wind's energy can be extracted? ρ_air = 1.25 kg/m³.

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Question 1

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Find the average density of a red giant star with a mass of 20 × 10³⁰ kg (approximately 10 solar masses) and a radius of 150 × 10⁹ m (equal to the Earth's distance from the sun).

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Question 2

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A police crime lab is trying to determine whether someone was murdered or died as a result of an accident. He was struck in the temple by a 4.20 kg sculpture that is alleged to have fallen off a bookcase. The sculpture presumably fell a distance of 1.43 m and the corner that struck him had an area of 0.250 cm². If the time for the sculpture to stop was 1.00 ms, the pressure on his temple, in N/m², was

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Question 3

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A wood block is placed on top of the ice in a large bowl half full of ice. The bowl is then filled to the brim with water, with the wood block riding on top of the ice. As the ice melts,

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Question 4

One hundred milliliters of water is poured into a U-tube that has a cross-sectional area of 1 cm². Then 100 milliliters of oil, with a density 80% that of water, is poured down one side of the U-tube so that the oil floats on the water. Find the difference in height of the liquid surfaces on the two sides of the U-tube.

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Question 5

A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 ATM = 1.01 × 10⁵ N/m².

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Question 6

A hydraulic lift raises a 2 000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm², what is the cross-sectional area of the larger piston?

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Question 7

A fountain sends a stream of water 20.0 m up into the air. If the base of the stream is 10.0 cm in diameter, what power is required to send the water to this height?

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Question 8

Water pressurized to 3.5 × 10⁵ Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?

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Question 9

A hose has been clamped so that the area at the clamp is only one quarter the area of the rest of the hose. When we ignore the viscosity of water, the ratio of the speed of the water through the clamped area to the speed of the water when it leaves the hose is

(Multiple Choice)

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Question 10

Find the average density of a white dwarf star if it has a mass equal to that of the sun (2.0 × 10³⁰ kg) and a radius equal to that of the Earth (6.4 × 10⁶ m).

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Question 11

To the nearest percent, what fraction of an iceberg is submerged? (ρ_ice = 917 kg/m³, ρ_sea = 1.03 × 10³ kg/m³.)

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Question 12

The pressure inside a commercial airliner is maintained at 1 ATM (1.01 × 10⁵ N/m²). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?

(Multiple Choice)

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Question 13

In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 10⁴ N/m and the pressure on the bottom surface is 9.0 × 10⁴ N/m². If the area of the top and bottom surfaces of each wing is 2.0 m², what is the total lift on the model airplane?

(Multiple Choice)

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Question 14

Melanie says that when a diver enters an underwater cave of height h, the pressure on her is no greater than ρ_Wgh. Rosalind says that if the bottom of the cave is a distance H below the water surface, the pressure on the soles of the diver's feet can reach ρ_WgH. Which one, if either, is correct? (The density of water is ρ_W.)

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Question 15

A vertical pipe, closed at the bottom end, is filled to a depth of 1.00 m with water and then an amount of oil of density is added to make the total depth 2.00 m. The oil and water don't mix with the oil floating on top of the water. What is the increase in pressure at the bottom end of the pipe as a result of adding the fluids?

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Question 16

The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?

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Question 17

Find the pressure in atmospheres in the water at the base of Dworshak Dam if the water in the reservoir is 200 meters deep. (1.01 × 10⁵ N/m² = 1 ATM.)

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Question 18

A boat is floating in a small pond. The boat then sinks so that it is completely submerged. What happens to the level of the pond?

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Question 19

The figure below shows a container filled with water to the height shown. When we compare the pressure at A to the pressure at B, we find that

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Question 20

Showing 1 - 20 of 53

Exam 14: Fluid Mechanics

A wind of velocity 10 m/s is blowing through a wind generator with blade radius 5.00 meters. What is the maximum power output if 30.0% of the wind's energy can be extracted? ρair = 1.25 kg/m3.

Find the average density of a red giant star with a mass of 20 × 1030 kg (approximately 10 solar masses) and a radius of 150 × 109 m (equal to the Earth's distance from the sun).

A wood block is placed on top of the ice in a large bowl half full of ice. The bowl is then filled to the brim with water, with the wood block riding on top of the ice. As the ice melts,

A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 ATM = 1.01 × 105 N/m2.

A hydraulic lift raises a 2 000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm2, what is the cross-sectional area of the larger piston?

A fountain sends a stream of water 20.0 m up into the air. If the base of the stream is 10.0 cm in diameter, what power is required to send the water to this height?

Water pressurized to 3.5 × 105 Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?

A hose has been clamped so that the area at the clamp is only one quarter the area of the rest of the hose. When we ignore the viscosity of water, the ratio of the speed of the water through the clamped area to the speed of the water when it leaves the hose is

Find the average density of a white dwarf star if it has a mass equal to that of the sun (2.0 × 1030 kg) and a radius equal to that of the Earth (6.4 × 106 m).

To the nearest percent, what fraction of an iceberg is submerged? (ρice = 917 kg/m3, ρsea = 1.03 × 103 kg/m3.)

The pressure inside a commercial airliner is maintained at 1 ATM (1.01 × 105 N/m2). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?

In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 104 N/m and the pressure on the bottom surface is 9.0 × 104 N/m2. If the area of the top and bottom surfaces of each wing is 2.0 m2, what is the total lift on the model airplane?

The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?

Find the pressure in atmospheres in the water at the base of Dworshak Dam if the water in the reservoir is 200 meters deep. (1.01 × 105 N/m2 = 1 ATM.)

A boat is floating in a small pond. The boat then sinks so that it is completely submerged. What happens to the level of the pond?

The figure below shows a container filled with water to the height shown. When we compare the pressure at A to the pressure at B, we find that

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A wind of velocity 10 m/s is blowing through a wind generator with blade radius 5.00 meters. What is the maximum power output if 30.0% of the wind's energy can be extracted? ρ_air = 1.25 kg/m³.

Find the average density of a red giant star with a mass of 20 × 10³⁰ kg (approximately 10 solar masses) and a radius of 150 × 10⁹ m (equal to the Earth's distance from the sun).

A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 ATM = 1.01 × 10⁵ N/m².

A hydraulic lift raises a 2 000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm², what is the cross-sectional area of the larger piston?

Water pressurized to 3.5 × 10⁵ Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?

Find the average density of a white dwarf star if it has a mass equal to that of the sun (2.0 × 10³⁰ kg) and a radius equal to that of the Earth (6.4 × 10⁶ m).

To the nearest percent, what fraction of an iceberg is submerged? (ρ_ice = 917 kg/m³, ρ_sea = 1.03 × 10³ kg/m³.)

The pressure inside a commercial airliner is maintained at 1 ATM (1.01 × 10⁵ N/m²). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?

In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 10⁴ N/m and the pressure on the bottom surface is 9.0 × 10⁴ N/m². If the area of the top and bottom surfaces of each wing is 2.0 m², what is the total lift on the model airplane?

Find the pressure in atmospheres in the water at the base of Dworshak Dam if the water in the reservoir is 200 meters deep. (1.01 × 10⁵ N/m² = 1 ATM.)