The choices describe four hypothetical planets. Which one would you expect to have the hottest interior? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: twice as big as Earth
Distance from Sun: same as Mercury
Rotation rate: once every 6 months
B) Size: same as the Moon
Distance from Sun: same as Mars
Rotation rate: once every 10 days
C) Size: same as Mars
Distance from Sun: same as Earth
Rotation rate: once every 18 hours
D) Size: same as Venus
Distance from Sun: same as Mars
Rotation rate: once every 25 hours
A) Size: twice as big as Earth
Distance from Sun: same as Mercury
Rotation rate: once every 6 months
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Compare the graph above to Figure 8.14, which shows the decay of potassium-40. Which element is more radioactive (undergoes radioactive decay more quickly)?
A) uranium-235 B) potassium-40 C) Both are equally radioactive.
If the velocity of wind is doubled, then the power output will increase by
A. 10 times B. 8 times C. 2 times E. 6 times
A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
A. ?14 J B. ?12 J C. ?10 J D. ?16 J E. ?25 J
The planet with the Great Red Spot is
a. Jupiter. b. Neptune. c. Uranus. d. Saturn. e. Mars.