Questions from Modern Physics


Q: A closed container is partially filled with water. Initially, the

A closed container is partially filled with water. Initially, the air above the water is at atmospheric pressure (1.01 × 105 Pa) and the gauge pressure at the bottom of the water is 2500 Pa. Then addi...

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Q: For the hydraulic lift shown in Fig. 12.7,

For the hydraulic lift shown in Fig. 12.7, what must be the ratio of the diameter of the vessel at the car to the diameter of the vessel where the force F1 is applied so that a 1520-kg car can be lift...

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Q: Why must a water skier moving with constant velocity lean backward?

Why must a water skier moving with constant velocity lean backward? What determines how far back she must lean? Draw a free-body diagram for the water skier to justify your answers.

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Q: The piston of a hydraulic automobile lift is 0.30 m

The piston of a hydraulic automobile lift is 0.30 m in diameter. What gauge pressure, in pascals, is required to lift a car with a mass of 1200 kg? Also express this pressure in atmospheres.

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Q: The surface pressure on Venus is 92 atm, and the acceleration

The surface pressure on Venus is 92 atm, and the acceleration due to gravity there is 0.894g. In a future exploratory mission, an upright cylindrical tank of benzene is sealed at the top but still pre...

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Q: A rock has mass 1.80 kg. When the rock

A rock has mass 1.80 kg. When the rock is suspended from the lower end of a string and totally immersed in water, the tension in the string is 12.8 N. What is the smallest density of a liquid in which...

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Q: A 950-kg cylindrical can buoy floats vertically in seawater.

A 950-kg cylindrical can buoy floats vertically in seawater. The diameter of the buoy is 0.900 m. Calculate the additional distance the buoy will sink when an 80.0-kg man stands on top of it.

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Q: A slab of ice floats on a freshwater lake. What minimum

A slab of ice floats on a freshwater lake. What minimum volume must the slab have for a 65.0-kg woman to be able to stand on it without getting her feet wet?

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Q: An ore sample weighs 17.50 N in air. When

An ore sample weighs 17.50 N in air. When the sample is suspended by a light cord and totally immersed in water, the tension in the cord is 11.20 N. Find the total volume and the density of the sample...

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Q: You purchase a rectangular piece of metal that has dimensions 5.

You purchase a rectangular piece of metal that has dimensions 5.0 × 15.0 × 30.0 mm and mass 0.0158 kg. The seller tells you that the metal is gold. To check this, you compute the average density of th...

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