In the Sun, nuclear fusion occurs
A. throughout the entire star.
B. only in the core.
C. in concentric shells
D. in the core and the radiative zone.
Answer: B
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An air track cart with mass m and speed v moving along an air track collides with a stationary cart with a mass m/3. After the collision the first cart has a speed v/2. What is the speed of the second cart?
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What evidence suggests that life arises relatively easily?
A) Life was present on Earth soon after the end of the heavy bombardment. B) Life is currently present in extreme environments like deep ocean volcanic vents. C) All organisms on Earth use DNA as their genetic material. D) Tardigrades, small animals, can survive exposure to the near-vacuum of space.