A machine operates between 300C and 30C. What's its maximum possible
efficiency?
An engine takes in 80J at 100C and exhausts 40J at what Celsius temp?
My fridge sits in the kitchen where it's always 30C. If the fridge
can manage to keep food at 3C, what is its coefficient of performance?
Explain whether a heat pump can draw heat from the outdoors when the
outdoors is colder than the inside of the building.
Oops. Someone left the fridge door open. Does the kitchen
heat up or cool down?
You sweat out 6g of water doing exercise. How many J of heat does
it take with you when it leaves?
How much work does a machine do when it goes from .3m3 to
.9m3 under 100Pa of oressure?
Why isn't time travel (like in a time machine) possible?