Nuclear Fission and Fusion: The main fuel for producing energy in the center of the sun is
A. helium.
B. hydrogen.
C. uranium.
D. any radioactive material.
E. oxygen.
Answer: B
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You see a lightning flash and half a second later hear a loud blast of thunder. How far away did the lightning hit?
a. about a mile b. half a mile c. a tenth of a mile d. none of the above
Conservation of Momentum: Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake. The person in the front throws a very massive ball toward the back, and the person in the back catches it. After the ball is caught, the canoe is
A. moving backward. B. stationary. C. moving forward.
Vision Problems: Nearsightedness is usually corrected with
A. converging lenses. B. diverging lenses. C. convex mirrors. D. cylindrical lenses. E. concave mirrors.
Uranus and Neptune appear blue or blue-green because
a. their atmospheres absorb blue light very efficiently. b. their solid air-less surfaces are this color c. their surfaces are covered with liquid water with no atmosphere d. traces of methane in their atmospheres absorb red light very efficiently.