As an air parcel expands and cools, or compresses and warms, with no interchange of heat with its surroundings, the situation is called
A) temperature equilibrium.
B) an adiabatic process.
C) stable equilibrium.
D) lapse rate.
Answer: B
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A. $0.95 B. $0.14 C. $1.62 D. $2.66
Estimate the cross-sectional area required for a 30-cm-long methanol-nickel heat pipe to transport 30 W at atmospheric pressure.
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You are in a spaceship moving past Earth at nearly lightspeed and you observe Mort, who is on Earth. You measure his mass, pulse rate, and size. How are they different from the values measured by Mort himself?
A) Mass has decreased, pulse rate has speeded up, and size is reduced along the direction of motion. B) Mass has increased, pulse rate has speeded up, and size is reduced along the direction of motion. C) Mass has increased, pulse rate has slowed down, and size is reduced along the direction of motion. D) They are unchanged, i.e., they are normal. E) Mass has decreased, pulse rate has slowed down, and size is reduced along the direction of motion.
Imagine a small magnet with its north pole vertically upward passing near the south pole of an external magnet that is above the small magnet. In what direction does the net force acting on the magnet point?
A. Upward. B. Downward. C. There is zero net force. D. None of the above (explain).