Billy swims to a point straight across a 100. m wide river that flows at 1.2 m/s. How long does it take him to swim to the other side?
What will be an ideal response?
46. s
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Suppose that an object’s entropy increases from zero when its thermal energy is U = 0 to some maximum value when U = 
Umax, and then goes back to zero when U = Umax (as shown in the drawing below). The greatest thermal energy U that such an object could have when in thermal equilibrium with a normal object is closest to which of the following?
A. 0
B. 
Umax
C. 
Umax
D. 
Umax
E. Umax
F. Other (specify)
Name four ways that the interstellar medium reveals its presence
What will be an ideal response?
From Kepler's ________ law, we conclude that the planets do not move with constant speed.
A. First B. Second C. Third D. Fourth
If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?
a. 8.75 × 10^3 Mpc b. 2.4 × 10^9 Mpc c. 5.6 × 10^5 Mpc d. 114 Mpc e. 8.75 × 10^-3 Mpc