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

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

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

An empty spice bottle has an inner volume of 1.31 × 10−4 m3. It has a mass of 112 g when filled with air, and it displaces 1.63 × 10−4m3 of water when fully submerged. What volume of mercury (ρHg = 13.6 × 103 kg/m3) must be added to the empty bottle so that it will just submerge?

A) 3.75 cm3 B) 12.0 cm3 C) 101 cm3 D) 147 cm3 E) 237 cm3 A) 3.75 cm3 B) 12.0 cm3 C) 101 cm3 D) 147 cm3 E) 237 cm3

Exam 15: Fluids

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 1

Correct Answer:

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Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?

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Question 2

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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 3

Correct Answer:

Verified

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).

(Multiple Choice)

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Question 4

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 5

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 6

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 7

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 8

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.

(Multiple Choice)

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Question 9

All people come very close to being able to float in water. What therefore is the volume (in cubic meters) of a 50-kg woman?

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Question 10

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 11

When water freezes, it expands about nine percent. What would be the pressure increase inside your automobile engine block if the water in there froze? The bulk modulus of ice is 2.0 × 10⁹ N/m², and 1 atm= 1.01 × 10⁵N/m².

(Multiple Choice)

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Question 12

A Venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (ρ = 1.2 kg/m³.)

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Question 13

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 14

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 15

A natural gas pipeline with a diameter 0.250 m delivers 1.55 cubic meters of gas per second. What is the flow speed of the gas in the pipeline?

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Question 16

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 17

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?

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Question 18

A cube of water ice (ρ = 0.917 × 10³ kg/m³) is placed in mercury (ρ = 13.6 × 10³ kg/m³), which is liquid at 0° Celsius. If we ignore any possible melting of the ice cube and problems with the surface tension of mercury, the fraction of the ice cube that floats above the surface of the mercury is

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Question 19

An empty spice bottle has an inner volume of 1.31 × 10⁻⁴ m³. It has a mass of 112 g when filled with air, and it displaces 1.63 × 10⁻⁴m³ of water when fully submerged. What volume of mercury (ρHg = 13.6 × 10³ kg/m³) must be added to the empty bottle so that it will just submerge?

(Multiple Choice)

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Question 20

Showing 1 - 20 of 53

Exam 15: Fluids

Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?

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).

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.)

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?

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.

All people come very close to being able to float in water. What therefore is the volume (in cubic meters) of a 50-kg woman?

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

When water freezes, it expands about nine percent. What would be the pressure increase inside your automobile engine block if the water in there froze? The bulk modulus of ice is 2.0 × 109 N/m2, and 1 atm= 1.01 × 105 N/m2.

A Venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (ρ = 1.2 kg/m3.)

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

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?

A natural gas pipeline with a diameter 0.250 m delivers 1.55 cubic meters of gas per second. What is the flow speed of the gas in the pipeline?

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 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?

An empty spice bottle has an inner volume of 1.31 × 10−4 m3. It has a mass of 112 g when filled with air, and it displaces 1.63 × 10−4m3 of water when fully submerged. What volume of mercury (ρHg = 13.6 × 103 kg/m3) must be added to the empty bottle so that it will just submerge?

Getting Started

One-Dimensional Motion

Vectors

Two- and Three-Dimensional Motion

Newtons Laws of Motion

Applications of Newtons Laws of Motion

Gravity

Conservation of Energy

Energy in Nonisolated Systems

Systems of Particles and Conservation of Momentum

Collisions

Rotation I: Kinematics and Dynamics

Rotation II: a Conservation Approach

Static Equilibrium, Elasticity, and Fracture

Oscillations

Traveling Waves

Superposition and Standing Waves

Temperature, Thermal Expansion, and Gas Laws

Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

Entropy and the Second Law of Thermodynamics

Electric Forces

Electric Fields

Gausss Law

Electric Potential

Capacitors and Batteries

Current and Resistance

Direct Current Dc Circuits

Magnetic Fields and Forces

Gausss Law for Magnetism and Amperes Law

Faradays Law of Induction

Inductors and Ac Circuits

Maxwells Equations and Electromagnetic Waves

Diffraction and Interference

Applications of the Wave Model

Reflection and Images Formed by Reflection

Refraction and Images Formed by Refraction

Relativity

Filters

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).

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 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.

When water freezes, it expands about nine percent. What would be the pressure increase inside your automobile engine block if the water in there froze? The bulk modulus of ice is 2.0 × 10⁹ N/m², and 1 atm= 1.01 × 10⁵N/m².

A Venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (ρ = 1.2 kg/m³.)

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 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?

An empty spice bottle has an inner volume of 1.31 × 10⁻⁴ m³. It has a mass of 112 g when filled with air, and it displaces 1.63 × 10⁻⁴m³ of water when fully submerged. What volume of mercury (ρHg = 13.6 × 10³ kg/m³) must be added to the empty bottle so that it will just submerge?