An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
a. 0 K.
b. 0°C.
c. 0°F.
d. 0°R.
e. the same as the temperature of the heat source.
a
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For all reversible processes involving a system and its environment:
A. the entropy of the system does not change B. the entropy of the system increases C. the total entropy of the system and its environment does not change D. the total entropy of the system and its environment increases E. none of the above
Where in the Sun do fusion reactions happen?
A) core and radiation zone B) only the core C) everywhere inside the Sun
The potential energy of an 80 kg male and a 60 kg female standing together on a promontory at some height above the surrounding plane is the same
What will be an ideal response?
Transmitting power at high voltage, e.g., 400,000 V, reduces the power loss for transmission lines. But such a voltage would destroy electrical devices in household use. How then can such 400,000 V electricity be used in a normal house?
a. The ground prongs on household plugs reduce the voltage to 120 V. b. Before reaching households, transformers are used to reduce the voltage appropriately. c. No matter the incoming voltage, a 120 V device only lets 120 V in. d. The 400,000 V is just theoretical; long distance transmission lines actually use 120 V.