Physics Quiz 4 Review

Which of these units to temp is larger?

A) a kelvin B) ℃ C) both of these C) both of these ꕔTK = ꕔTC ꕔT = 20 K = ꕔT = 20 ℃

When a solid changes to a liquid, the solid

A) absorbs energy

If glass expanded more than mercury in a thermometer, then the column of mercury will fall when the temperature.

A) increases

When mechanical work is done on a system, an increase normally occurs in its

A) internal energy U (∆U>0) B) temperature C) both of these C) both of these

Dean teaches that regulation is due to

A) open-structured nature of ice crystals

Which of these are good insulators?

A) snow B) wood C) feathers D) all of these D) all of these

The ideal efficiency for a heat engine operating between the temps of 2700 K and 300 K is ? 2700-300 = 2400 2400/2700 x 100%

B) 89 %

Open spaces in ice crystals contribute to

B) decreased density

The addition of salt to water affects its

B) freezing point

Compared to a giant iceberg, a hot cup of coffee has

B) higher temp. but less internal energy

The main purpose of the condenser in the steam cycle is to

B) lower pressure on the back side of the turbine-baldes

In practice, a good insulator

B) slows heat flow --> Q

Which of the following expands more when the temperature is increased? Equal volumes of ...

gas A) Helium H24

1) A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have ?

A) Your temp

If you measure the width of an outdoor barn with a steel tape on a very cold day, your measured width will be ?

A) A bit long

Evaporation is a colling process and condensation is

A) A warming process

An example of a heat engine is

A) An aircraft turbine B) the gasoline motor of a leaf blower C) the steam engine of a railroad train D) An automobile internal combustion motor E) all of the above E) all of the above

Adiabatic process occur in Earth's

A) Atmosphere B) Oceans C) Mantle D) All of the above D) All of the above

Both black and white road surfaces absorb sunlight. The warmer road surface at the end of the day is ? No radiation losses

A) Black surface

4) A soda can containing only steam is placed top downward in a pan of water. Whap! The can is dramatically crushed by atmospheric pressure. The reduced pressure inside the can is due to ?

A) Condensation of the steam inside

3) A canteen that is wet on the outside results in water inside that is

A) Cooler

If you release a single molecule in an evacuated region it will initially

A) Fall just as a baseball would

2) A bridge is most likely to be ice covered than the roadway on a cold day because?

A) Heat upwelling from the ground below is absent on a bridge

Water in a car radiator sometimes boils explosively when the radiator cap is removed, which is due to sudden

C) reduced pressure

When an iron ring is heated, the hole becomes

D) Larger