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.
Ans: E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.
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What type of bond is formed whenever atoms share a pair of electrons?
a. covalent b. hydrogen c. ionic d. double e. peptide
Two charged particles, Q1 and Q2, are a distance r apart with Q2= 5Q1. Compare the forces they exert on one another when 
is the force Q2 exerts on Q1 and 
is the force Q1 exerts on Q2.
A.
.B.
.C.
.D.
.E.
.A gasoline engine with an efficiency of 40.0% operates between a high temperature T1 and a low temperature T2 = 320 K. If this engine operates with Carnot efficiency, what is the high-side temperature T1?
a. 1070 K c. 533 K b. 868 K d. 457 K
Einstein theories tell us that the speed of light
A) depends on one's frame of reference. B) is constant in all frames of reference. C) provides accurate clocks. D) slows in a transparent medium.