What is the approximate age of the star cluster in the accompanying figure (Figure 12-1)?
Ans: 10 billion years
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The greenhouse effect keeps the surface of ________ warmer than it otherwise would be.
A. Mercury B. Earth C. Venus D. All of these choices are correct. E. None of these choices is correct.
Which Jovian moon shows the most diverse terrain, suggesting a violent impact broke it into many pieces, some of which reformed it as a jumbled puzzle?
A) Ganymede B) Triton C) Io D) Enceladus E) Miranda
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless 30.0 degrees incline. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The acceleration of the 4.00 kg mass is
A. 2.98 
B. 3.92
C. 5.88
D. 6.86
E. 7.84
The number of nodes in a standing wave of three wavelengths, not including the endpoints, is
A) 2. B) 3. C) 4. D) 5. E) 6.