PHYS Quiz 4

Which of these are good insulators

-Feathers -Snow -Wood

When a solid is changed to a liquid phase, the solid

Absorbs energy

Adequate processes occur in earths

All -Atmosphere -A... -Mantle

The main purpose of the condenser in the steam cycle of a steam turbine

To lower pressure on the back side of the turbine blade

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

Your temp

An example of a heat engine is

all of the above

The ideal (theoretical) efficiency of a heat engine between the temps 2700k and 300k

89%

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

A bit long

Evaporation is a cooling process and condensation is

A warming process

Both black and white road surfaces absorb sunlight. The warmer road surfaces at the end of a sunny day

Black surface will be warmer

A soda-pop can containing only steam is placed top downward in a pan of water. The can is crushed by atmospheric pressure. The reduced pressure inside is due to

Condensation of steam inside

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

Cooler

Open spaces on ice crystals constribute

Decrease on density

When mechanical work is done on a system, there can be an increase in its

Energy and Temp

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

Fall just as a baseball would

A bridge is more likely to be ice covered when the roadway on a cold day because

Heat upwelling from the ground below is absent on the bridge

Which of the following expands more when temp increases equal volumes of

Helium

Compared to a giant iceberg, a hot cup of coffee has A) more internal energy and higher temperature. B) higher temperature, but less internal energy. C) a greater specific heat and more internal energy. D) none of these

Higher temp and less internal energy

If glass expanded more than mercury, then the column of mercury in a mercury thermometer would rise when the temperature

Increases

Which of these units of temp is larger?

Kelvin and a celcius degree are the same size

When an iron ring is heated, the hole becomes

Larger

Dean teaches the phenomena of regulation is due to the

Open structure nature of ice crystals

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

Reduce pressure

In practice, good insulator

Slows heat flow