What makes refrigerators and air conditioners possible, in view of the second law of thermodynamics?
a. The fact that heat naturally moves from cooler regions to hotter ones.
b. The addition of mechanical work to the system.
c. The chance occurrences of heat flow from cooler to hotter systems.
d. The use of electricity, not heat.
e. The fact that no energy is wasted as heat in this kind of system.
b
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Young's Modulus: A solid steel column is 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 2.0 × 1011 N/m2. By what distance does the column shrink when a 5000-kg truck is supported by it?
A. 8.0 × 10-7 m B. 3.2 × 10-6 m C. 7.8 × 10-6 m D. 3.1 × 10-5 m
When you simultaneously drop a light tennis ball and a heavy bowling ball, they hit the floor
A) at the same speed. B) with the same force. C) with the same momentum. D) all of the above E) none of the above
The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464?. What is the orbital quantum number l of the electron?
A) 1 B) 2 C) 3 D) 4 E) 5
If the greenhouse effect on Earth were absent, Earth's average temperature would be about
A) -18°C. B) appreciably warmer. C) as it is now.