AP Physics: Pressure & Buoyancy

A rock of irregular shape sinks to the bottom of water when placed in it. Which two of the following, when used together, could be used to determine its density?

• Measure the mass of the rock on a scale

• Measure the mass of the beaker of water on a scale

• Place the rock in a beaker and measure the change in height of the water

• Place the rock in a beaker and measure the height of the water above it

You fill a glass with ice and water until the the water level is exactly at the glass's rim. As the ice melts, the water level...

• rises and water spills out of the glass

• remains the same

• drops at first and then rises until a little water spills out

Tags

NGSS.MS-PS1-4

A simple U-tube or manometer has a side filled with water and another with an unknown blue fluid. Which side has the larger absolute pressure at the bottom of its column?

• left

• right

• equal

In the same system, which fluid has the greater density?

• water

• unknown fluid

• both have the same density

Rank the fluids in order from most dense to least dense.

• Fluid A, oil, water, mercury

• oil, water, Fluid A, mercury

• mercury, oil, water, Fluid A

• mercury, Fluid A, water, oil

A hydraulic lift has a left and right column of different areas. Which side has the greater pressure?

• A₁

• ^A₂

• Same

A hydraulic lift has a left and right column of different areas. Which side should a car be placed on to be lifted by the system with the least input force?

• A₁

• ^A₂

• Same

A personal submarine is spherical and can reach depths of up to 1 mile below the surface of the water. Which statement is true?

• The pressure is equal on all sides of the sphere

• The pressure is slightly larger on the bottom of the sphere than the top

• The pressure is slightly larger on the top of the sphere than the bottom

Two spheres have equal volume in the air. One is a balloon and the other is a solid wood sphere. When brought into the water, the balloon's radius is ________ the wood's radius.

• less than

• greater than

• equal to

Now the same two spheres are made to be equal volume in the water. The moment you release them, which experiences the greater buoyant force?

• wood

• balloon

• same buoyant force