Which planets have densities similar to that of Earth's?
A. Uranus and Neptune
B. Mars and Mercury
C. Pluto and Charon
D. Jupiter and Saturn
Answer: B
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What key process underlies why Mars changed so much from its early conditions to its conditions today?
a. Outgassing. b. Interior cooling. c. Slowing of its rotation rate. d. Evaporation of its ocean.
What is the cosmic microwave background, and why is it significant?
What will be an ideal response?
The first successful landers on the surface of Mars were:
A) Mariners 4 and 5 in 1965. B) Vikings 1 and 2 in 1976. C) Voyagers 1 and 2 in 1979. D) Pathfinder and Sojourner in 1997. E) Spirit and Opportunity in 2004.
A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?
a. 9.9 s b. 7.8 s c. 8.5 s d. 9.2 s e. 6.4 s