Suppose the pressure of 20 g of an ideal monatomic gas is tripled while its volume is halved. What happens to the internal energy of the gas?
a. It stays the same, as the described changes do not involve internal energy.
b. It increases.
c. It decreases 33%.
d. This depends on the molecular weight of the gas involved, thus this is indeterminate.
B
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The ecliptic is
a. the centerline of the zodiac. b. the projection of Earth's orbit on the sky. c. the apparent path of the Sun around the sky. d. the centerline of the zodiac, the projection of Earth's orbit on the sky, and the apparent path of the Sun around the sky. e. None of the other choices are correct.
The earth formed 4.57 X 10^9 years ago. What is this time in seconds?
A. 1.67 X10^12 S B. 4.01 X 10^13 S C. 2.40 X 10^ 9 S D. 1.44 X 10^17 S
How fast must a spaceship travel to make the trip to a star 400. LY away in 25.3 years of astronaut travel time?
A) 0.966c B) 0.998c C) 0.829c D) 0.987c E) 0.992c
In a capacitor in an AC circuit, the voltage:
a. leads the current by 90°. b. lags the current by 90°. c. may lead or lag the current depending on the frequency. d. is in phase with 70.7% of the current.