Part A: During a storm, the wind blows horizontally across the surface of a flat

Question

Part A:

During a storm, the wind blows horizontally across the surface of a flat roof. What's the direction of the resulting net force on the roof? Hint: Consider Bernoulli's principle.?

a- downward

b- upward

Part B:

A gas-filled balloon is submerged in a fluid. As a result, the balloon is subject to inward forces from all sides. How does the volume of the balloon change?

a- The volume of the object remains constant.

b- The volume of the object increases.

c- The volume of the object decreases.

d- It is impossible to predict volume changes without additional information.

Part C:

You're swimming underwater and exhale an air bubble, which floats to the surface. As the bubble rises, does its size increase, decrease, or remain the same?

a- increases

b- decreases

c- remains the same

Explanation / Answer

part A.
The flat Roof feels upward lift due to the higher indoor pressure compared to the upper outdoor air
Answer: b- upward

part B.
As it is getting compressed from all sides. Its volume decreases.
Answer: c- The volume of the object decreases.

part C:
As bubble rises, pressure decreases. So the amount by which it was compressed by water decreases. So its volume will increase
a- increases

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