Why have very few planets with low mass (comparable to Mars or Mercury) been found?
A) These small planets are very rare.
B) Low mass planets do not produce large enough radial velocity changes in their stars.
C) High mass planets are blocking our views of low mass planets.
D) Hot Jupiters have ejected most low mass planets from their solar systems.
E) Low mass planets are too far from their parent stars to receive enough light to make them visible from Earth.
B
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Energy and Momentum: If you want to double the momentum of a gas molecule, by what factor must you increase its kinetic energy?
A. 
B. 2
C. 2
D. 4
E. 16
In a certain gas the molecules are 5.0 × 10?9 m apart on average, have a mean free path of 5.0×10?6 m, and have an average speed of 500 m/s. The rate at which a molecule has collisions with other molecules is about:
A. 10?11 s?1 B. 10?8 s?1 C. 1 s?1 D. 10^8 s?1 E. 10^11 s?1
Consider a situation where two moving objects collide, stick to each other, and move off together.Linear momentum
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved, depending on the nature of the collision. d. none of the above
For a body oscillating at the end of a spring, the energy is
a. kinetic energy. b. elastic potential energy. c. gravitational potential energy. d. all of the above. e. none of the above.