In which process will the internal energy of the system NOT change?
a. An adiabatic expansion of an ideal gas.
b. An isothermal compression of an ideal gas.
c. An isobaric expansion of an ideal gas.
d. The freezing of a quantity of liquid at its melting point.
e. The evaporation of a quantity of a liquid at its boiling point.
B
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If the Sun were replaced by a one solar mass black hole
A) all terrestrial planets would fall in immediately. B) we would still orbit it in a period of one year. C) we would immediately escape into deep space, driven out by its radiation. D) our clocks would all stop. E) life here would be unchanged.
What are the important modes of heat transfer for a person sitting quietly in a room? What if the person is sitting near a roaring fireplace?
GIVEN - Person sitting quietly in a room - Person sitting in a room with a fireplace FIND (a) Modes of heat transfer for each situation ASSUMPTIONS - The person is clothed
When ice that floats in water melts, the surrounding water level
A) falls. B) remains unchanged. C) rises.
Two masses, MA and MB, with MB = 2MA, are released at the same time and allowed to fall straight down. Neglect air resistance. When we compare their kinetic energies after they have fallen for equal times, we find that
a. KB = KA. b. KB = 2KA. c. KB = 4KA. d. KA = 2KB. e. KA = 4KB.