The period of a satellite circling planet Nutron is observed to be 84 s when it is in a circular orbit with a radius of 8.0 × 10^6 m. What is the mass of planet Nutron?
a. 6.2 × 10^28 kg
b. 5.0 × 10^28 kg
c. 5.5 × 10^28 kg
d. 4.3 × 10^28 kg
e. 3.7 × 10^28 kg
d
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Applications to Astronomy: Estimate the speed of recession of a galaxy that is 10 billion light-years away if H = 20 
? (c = 3.00 × 108 m/s)
A. 0.1c B. 0.3c C. 0.5c D. 0.7c
In which direction do hurricanes in the Southern Hemisphere rotate?
a. clockwise b. counterclockwise c. either direction
Why do we think that quasars are extremely distant?
A. They are very bright. B. They are very faint. C. Their light varies rapidly. D. Their spectra show immense redshifts.
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion that starts at this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which step does the entropy of the system increase?
a. 1 b. 2 c. 3 d. 4