A sinusoidally varying potential difference has amplitude 170 V. What is its average value?
1.170 V
2.120 V
3.0
4.-120 V
5.-170 V
3
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(Do not try the following: it could kill you. This question is only about a hypothetical possibility.) If you were standing below an object emitting a fixed frequency sound falling at terminal velocity, as it approached you, you would hear the sound
a. drop in frequency. b. stay at the same frequency. c. increase in frequency. d. decrease in loudness. e. stay at the same loudness.
What accelerating potential in an electron microscope would give electrons a wavelength 
10 m?
A. 37.5 V B. 75.0 V C. 150 V D. 300 V
The melting point of aluminum is 660°C, the latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900 J/(kg K). How much heat must be added to 500 g of aluminum at 27°C to completely melt it?
A) 485 kJ B) 395 kJ C) 273 kJ D) 147 kJ E) 14 kJ
The Cretaceous extinction that wiped out 60% of Earth's species (including the dinosaurs) is attributed to
A) the break-up of Pangaea. B) meteorite bombardment. C) massive volcanic eruptions. D) all of the above