What source of energy might keep an ocean beneath the surface of Callisto liquid?
A) tidal heating only
B) radioactive decay only
C) tidal heating and radioactive decay
D) heat released from a partially molten core
B
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A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct?
A) The total momentum both before and after the collision is 24 kg ? m/s. B) The total momentum before the collision is 24 kg ? m/s, and after the collision is 0 kg ? m/s. C) The total momentum before the collision is 0 kg ? m/s, and after the collision is 24 kg ? m/s. D) The total momentum both before and after the collision is zero. E) None of the above is true.
Why does the surface of Triton appear so young?
What will be an ideal response?
The element iron, having atomic number 26, is the "crossover point" between fusion and fission. Why?
A) Because all elements heavier than iron are radioactive, implying that they will fission easier than they will fuse. B) Because of the neutron balance that results from splitting a nucleus. C) Because for elements lighter than iron, fusion converts nuclear energy to non-nuclear energy, whereas for elements heavier than iron, fission converts nuclear energy to non-nuclear energy. D) Because neutrons will only split the elements that are heavier than iron. E) Because for elements lighter than iron, fusion converts non-nuclear energy to nuclear energy, whereas for elements heavier than iron, fission converts non-nuclear energy to nuclear energy.
Which of the following is not a terrestrial planet?
a. Earth b. Mars c. Saturn d. Venus