E2020 Physics: Fluids and Buoyant Force

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Answers are confirmed.

Which of the following is a fluid?

Helium

Which of the following is not a fluid?

Wood

How does a liquid differ from a gas?

A liquid has definite volume, unlike a gas.

When a gas is transferred from one container into another container, which of the following does not occur?

The gas keeps its original volume.

A buoyant force acts in the opposite direction of gravity. According to Archimedes' Principle, which of the following is true of an object completely submerged in water?

The magnitude of the upward buoyant force on the object is equal to the weight of the fluid displaced by the object.

Which of the following statements about floating objects is always true?

The buoyant force equals the weight of the object.

Which of the following statements about completely submerged objects resting on the ocean bottom is correct?

The apparent weight of the object depends on the object's density.

A fluid has a definite volume but not a definite shape.

True

Density determines whether an object sinks or floats.

True

A piece of silver with a mass of 6.88 kg is placed in fresh water (mass density = 1.00 g/cm). What is the density of the silver if it has an apparent weight of 61.0 N?

10.5 g/cm^3

For incompressible fluids, density changes a little with changes in

pressure.

According to legend, to determine whether the king's crown was made of pure gold, Archimedes measured the crown's volume by determining how much water it displaced. The density of gold is 19.3 g/cm3. If the crown's mass was 6.00 ´ 102 g, what volume of water would have been displaced if the crown was indeed made of pure gold?

31.1 cm^3

A buoyant force acts in the opposite direction of gravity. According to Archimedes' Principle, which of the following is true of an object completely submerged in water?

The magnitude of the upward buoyant force on the object is equal to the weight of the fluid displaced by the object.

Which of the following statements about completely submerged objects resting on the ocean bottom is correct?

The apparent weight of the object depends on the object's density.

If an object is only partially submerged in a fluid, which of the following is true?

The density of the fluid is greater than the density of the object.

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