Consider the fission reaction:
U + n ? 2 fission products + 2 n's
(a) Estimate the energy released in the reaction.
(b) If 3 neutrons had been released instead of 2, what energy would have been released?
(a) 234. MeV
(b) 233. MeV
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A 100 g lump of clay hits a wall at 70 cm/s and sticks. A 100 g rubber ball hits the same wall at 60 cm/s and rebounds with a speed of 30 cm/s. Which object experiences the larger impulse delivered by the wall during the collision?
How are the event horizon and Schwarzschild radius related?
A) The Schwarzschild radius is smaller than the distance from the singularity of a black hole to the event horizon. B) The Schwarzschild radius is equal to the distance from the singularity of a black hole to the event horizon. C) The Schwarzschild radius is greater than the distance from the singularity of a black hole to the event horizon. D) The size of the Schwarzschild radius is unrelated to the distance from the singularity of a black hole to the event horizon. E) The size of the Schwarzschild radius is proportional to the distance from the singularity of a black hole to the event horizon.
When the length of a simple pendulum is tripled, the time for one complete vibration increases by a factor of
A) 9. B) 1/9. C) 3. D) 1/3. E) .
Einstein's theory of the photoelectric effect treats light as photons. According to this theory,
1.all photons have the same energy. 2.photons that move faster have more energy. 3.photons with double the frequency have double the energy. 4.photons with double the frequency have half the energy.