200 J of work is done in compressing a gas adiabatically. What is the change in internal energy of the gas?
A)
zero
B)
100 J
C)
150 J
D)
200 J
E)
There is not enough information to determine.
D
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If you double the pressure on the surface of a can of water, the buoyant force on a stone placed in that water will
A) decrease, but not by one-half. B) increase, but not double. C) not change. D) double.
Three point charges are positioned on the x axis. If the charges and corresponding positions are +32 mC at x = 0, +20 mC at x = 40 cm, and -60 mC at x = 60 cm, what is the magnitude of the electrostatic force on the +32-mC charge?
a. 84 N b. 12 N c. 36 N d. 50 N e. 48 N
Where are the Cepheid and RR Lyrae variable stars located on the H-R Diagram?
a. just above and to the right of B type stars b. just above and to the right of O type stars c. in the variable strip d. in the instability strip e. outside the H-R Diagram as missing items
Which of the following best sums up current scientific thinking about the nature of dark energy?
A) Dark energy most likely consists of a form of photons that we can't see or detect. B) Dark energy is most likely made up of weakly interacting particles that do not interact with light. C) Dark energy probably exists, but we have little (if any) idea what it is. D) Dark energy is the source of the mind weapon used by Sith Lords in Star Wars.