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