Why do we sometimes observe asteroids at the distances of the gaps in the asteroid belt?
A) Jupiter's gravitational tugs keep them there.
B) They are held in place by resonances with other asteroids.
C) Actually, we never see asteroids in the gaps.
D) They are kept in place by shepherding asteroids.
E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.
E
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A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?
A) zero B) 1.6 × 10-20 N C) 3.2 × 10-20 N D) 1.6 × 10-21 N E) 3.2 × 10-21 N
A heating element inside a rigid plastic box in the form of a cube, 0.15 m on a side, is used to heat its contents, a volume of nitrogen gas (N2), which begins at standard temperature (0oC) and pressure (1 atm). If the heat input to the box is 185 J, what is the final temperature of the gas?
a. 
b. 
c. 
d. 
e. 
If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 
to 
How much heat is absorbed by the gas?
A. 389 J B. 544 J C. 436 J D. 288 J
Compared to the Earth, the moon is no longer geologically active because
a. it is rotating too slowly. b. its radioactive elements were never abundant. c. it is much smaller in mass. d. its crust is too thin. e. it does not have water on its surface.