What is the efficiency of a heat engine whose thermal energy input is 400 J and whose exhaust is 300 J?
A) 75% B) 50% C) 175% D) 25% E) 33%
D
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Why was it thought that Titan may have oceans of methane?
A) Titan's atmosphere contains traces of methane. Similarly, Earth's atmosphere contains traces of water vapor. So, scientist thought Titan should have methane oceans. B) The atmospheric pressure at Titan's surface and its surface temperature are such that methane should be liquid on Titan's surface. C) The abundance of hydrocarbons in the atmosphere of Titan, led scientists to believe that Titan had an abundance of methane on its surface. D) Titan's atmosphere is like Earth's (mostly nitrogen), but its temperature is too low for water to be in the liquid phase. The only other possible liquid was methane. E) Since Saturn has methane ice in its atmosphere, methane should be abundant in this region of the solar system. The sheer abundance of methane in the region led scientists to hypothesize methane oceans on Titan.
If a monochromatic light beam with quantum energy value of 1.6 eV incident upon a photocell where the work function of the target metal is 0.9 eV, what is the maximum kinetic energy of ejected electrons?
a. 2.5 eV b. 1.8 eV c. 0.7 eV d. 3.2 eV e. 1.3 eV
The only force acting on a 2.0-kg body as it moves along the x axis is given by Fx = (12 ? 2.0x) N, where x is in m. The velocity of the body at x = 2.0 m is 5.5 
direction?
a.
36 J
b.
39 J
c.
43 J
d.
46 J
e.
30 J
Explain the advantages and disadvantages of "superinsulated" homes
What will be an ideal response?