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Exam 14: Gases and Plasmas

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Question 21

Multiple Choice

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The faster a fluid moves,the

A) greater its internal pressure.
B) less its internal pressure.
C) internal pressure is unaffected.

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Question 22

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An umbrella tends to move upwards on a windy day principally because

A) air gets trapped under the umbrella,warms,and rises.
B) buoyancy increases with increasing wind speed.
C) air pressure is reduced over the curved top surface.
D) all of these

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Question 23

Multiple Choice

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When a gas is heated and becomes a plasma,its electric charge is usually

As a high-altitude balloon sinks lower and lower into the atmosphere,it undergoes a decrease in

Alcohol is less dense than water.If alcohol is used to make a barometer on a day when atmospheric pressure is normal,the height of the alcohol column would be

As a balloon rises higher and higher into the atmosphere,its

When gas in a container is squeezed to half its volume and the temperature remains the same,the gas pressure

Two vertical tubes of equal cross-sectional areas are filled with water and mercury.If water is filled to a depth of 10.3 m and mercury to a depth of 0.76 m,both liquids have equal

Compared to the buoyant force of the atmosphere on a 1-liter helium-filled balloon,the buoyant force of the atmosphere on a nearby 1-liter solid iron block is

Most of the mass of material that makes up a plasma is

Which of the following bodies is comprised mostly of plasma?

Compared to the buoyant force of the atmosphere on a 1-kilogram helium-filled balloon,the buoyant force of the atmosphere on a nearby 1-kilogram solid iron block is

If a strong wind from the west breaks a window in the north wall of a house,most of the glass will fall

Estimate the mass of air inside an average automobile.

A common 5-liter metal can will float in air if it is

A balloon is buoyed up with a force equal to the

The flight of a blimp best illustrates

Wind blowing over the top of a hill

About how high can water be theoretically lifted by a vacuum pump at sea level?

A suction cup sticks to a wall.It is