Why is Venus's surface hotter than Mercury's?
A. Clouds in Mercury's atmosphere reflect sunlight back into space and keep its surface cool.
B. Venus rotates more slowly, so it "bakes" more in the Sun's heat.
C. Venus is closer to the Sun.
D. Carbon dioxide in Venus's atmosphere traps heat radiating from its surface, thereby making it warmer.
Answer: B
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The materials that made up the solar nebula can be categorized into these four general types. Rank these materials from left to right based on the temperature at which each would condense into a solid, from highest to lowest. Note: For a substance that does not condense at all, rank it as very low temperature.
What will be an ideal response?
A crate sits on the ground. You push as hard as you can on it, but you cannot move it. At any given time when you are pushing, what is the magnitude of the static friction force exerted on the crate by its contact interaction with the ground compared to the magnitude of your push (which is a normal force)? (Hints: What is the crate’s acceleration? Draw a free-body diagram.)
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.
The spins of all known particles are either integral or half-integral multiples of
a. the baryon number. b. Plank's constant. c. the Gravitational constant. d. the speed of light.
If the wave function for a free electron is given by ? = A sin kx + B cos kx, and the electron has a speed of 5.2 x 106 m/s, what is the value for k?
A) 1.9 x 10-7 m-1 m-1 B) 1.2 x 10-6 m-1 C) 7.2 x 109 m-1 D) 4.5 x 1010 m-1 E) 3.8 x 1011 m-1