Bowie State University Fluids and Density Questions

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I’m working on a physics question and need an explanation and answer to help me learn.

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1.
Which of the following substances are fluids at room temperature and atmospheric pressure:
air, mercury, water, glass?
2.
Why are gases easier to compress than liquids and solids?
3.
Explain how the density of air varies with altitude.
5.
How is pressure related to the sharpness of a knife and its ability to cut?
6.
Why is a force exerted by a static fluid on a surface always perpendicular to the surface?
10.
Why does atmospheric pressure decrease more rapidly than linearly with altitude?
12.
Is there a net force on a dam due to atmospheric pressure? Explain your answer.
13.
Does atmospheric pressure add to the gas pressure in a rigid tank? In a toy balloon? When, in
general, does atmospheric pressure not affect the total pressure in a fluid?
18.
Do fluids exert buoyant forces in a åightless%nvironment, such as in the space shuttle?
Explain your answer.
19.
Will the same ship float higher in salt water than in freshwater? Explain your answer.

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