Physical Science (PSY151) Chapter 5: Les Thomas

Which of the following formulas relating temperatures on the Celsius and Fahrenheit scales is correct?

Tc = (5/9)(TF - 32°)

The pressure at the bottom of a barrel filled with liquid does not depend on the

area of the liquid surface

A barometer measures

atmospheric pressure

In order to operate, a heat engine must have

both a hot and a cold reservoir.

In an isolated system, entropy

cannot decrease

Which of the following quantities is independent of the size and shape of an object composed of a given material?

density

Suppose there were molecules that had no attraction whatsoever for one another. A collection of such molecules would form a

gas

Molecules are, in general, farthest apart from one another in

gases

Ice floats in water because

its density is less than that of water.

When heat is added to a body of matter, the resulting temperature increase does not depend upon

its shape

Heat conduction is most efficient in

metals

Buoyancy occurs because, as the depth in a fluid increases, the fluid's

pressure increases.

Heat can be transferred through a vacuum by which one or more of the following?

radiation

A refrigerator

removes heat from a region and carries it elsewhere

When a gas is forced into a smaller volume without a change in temperature, its pressure increases because its molecules

strike the container walls more often

Of the following, a molecule is best described as

the smallest particle of a substance that is representative of the substance.

Sublimation refers to

the vaporization of a solid without first becoming a liquid.

Oxygen boils at -183°C. This temperature is

-297°F.

The melting point of water is 0°C. Its freezing point is

0°C

A 2-kg brick has the dimensions 7.5 cm × 15 cm × 30 cm. The pressure the brick exerts when standing on its smallest face is

178Pa

The density of brass is 8 × 103 kg/m3. The volume occupied by 320 g of brass is

38 cm3

A temperature of 120°F is almost exactly

49°C

If a heat engine that exhausts heat at 400 K is to have an efficiency of 33%, it must take in heat at a minimum of

600 K

Heat can be transferred through a liquid by which one or more of the following?

Both A, B, and C