The average kinetic energy of a nitrogen molecule at room temperature (20°C) is
a. 2 × 10^-21 J.
b. 4 × 10^-21 J.
c. 6 × 10^-21 J.
d. 8 × 10^-21 J.
e. 1 × 10^-20 J.
E
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Which of the following statements is true of red dwarfs?
A) They have very little weight to support. B) Their life expectancies are very short. C) Their pressure-temperature thermostats are set high. D) They consume their hydrogen fuel at a rapid rate.
Coulomb's Law: As shown in the figure, three small charges are equally spaced on the arc of a circle that is centered at the charge Q, where Q = +23 nC and all the other quantities are accurate to two significant figures. What is the magnitude of the net electric force on the charge Q due to the other three charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
A. 2.6 × 10-4 N B. 1.7 × 10-4 N C. 2.1 × 10-4 N D. 3.1 × 10-4 N
The observation that there are asteroids made entirely of rock or entirely of iron suggests that ________.
A. large planetesimals formed entirely out of the same material B. these asteroids were formed from volcanic eruptions on early planets C. asteroids made of both rock and iron are particularly fragile and are easily destroyed D. the early Solar System had intermediate-sized differentiated planetesimals
A lamp rated 23W-120V means that it will deliver 23 W
A) when the voltage across it is 120 V. B) whether or not it is connected to 120 V. C) as long as the current is ac. D) none of the above