Momentum and energy from focused laser beams can be used in nuclear fusion. This is because
A. light is not magnetic.
B. the wavelength of light is small enough to penetrate each proton.
C. light cannot be melted, so its pressure can confine the reaction.
D. light can also function as a moderator, like graphite or water in a uranium reactor.
Answer: C
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Approximately how long did the era of nucleosynthesis last?
A) 10-10 second B) 0.001 second C) 5 seconds D) 5 minutes E) 5 years
Magnetic Poles: A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will
A. contain only a north pole. B. contain a north pole on the right and a south pole on the left. C. contain only a south pole. D. no longer contain any poles.
Notice that the parallax is greater (the apparent movement is larger) for the person than for the trees, and that the mountains do not appear to shift at all. Why?
A. The amount of parallax depends on an object's size, with greater parallax for larger objects. B. The amount of parallax depends on an object's size, with greater parallax for smaller objects. C. The amount of parallax depends on an object's distance, with greater parallax for more distant objects. D. The amount of parallax depends on an object's distance, with greater parallax for nearer objects.
During a collision with a wall, the velocity of a 0.200-kg ball changes from 20.0 m/s toward the wall to 12.0 m/s away from the wall
If the time the ball was in contact with the wall was 60.0 ms, what was the magnitude of the average force applied to the ball? A) 40.0 N B) 107 N C) 16.7 N D) 26.7 N E) 13.3 N