PHYS 223 Test #3 Flashcards
A stone falls against another stone on the moon. Does it make a sound?
No.(No air to travel through) Except the stones themselves.
T or F all frequencies of sound in air travel at the same speed.
T
The bending of a wave due to a change in its speed is called
refraction
When traveling through air, sound bends toward __ temp
cooler. (Sound travels faster in warm air)
The spreading of a wave as it emerges through an opening is called
defraction
Evaporation is a __process
cooling
What is the F of a pendulum that swings back adn forth 8x in 4 s?
Period: 1/F So the answer is 0.5 s
Why does rising air cool?
The rising warm air continues to expand, thus doing work on surrounding air and losing thermal energy.
If u denotes the total internal energy of a system, and that system does work W by pushing the walls outward, what is the new internal energy?
U-W 1st Law of thermal dynamics.
If a gas expands adiabatically, what happens to the temp?
It falls bc adiabatically means without heat and it does work. (Unless expanded into a vacuum)
Heat
Thermal energy being transferred from one object to another. Thus tub of hot water and ice water have the same heat.
Temp
Average translational KE per particle
IF you heat ice, the temp doesn’t increase. Where does it go?
PE.
Why does rising air that form clouds cool less than rising air that doesn’t form clouds?
Condensation releases Thermal EnERGY
A battery supplies ___ for an electrical circuit. It does not provide___
Energy, not electrons
