In the fusion of low-mass nuclei to make heavier nuclei
A) thermal energy is produced.
B) nuclear energy is converted to other forms.
C) the final nucleus has a smaller rest-mass than the total rest-mass of the original nuclei.
D) All of the above.
D
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The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 15.6 cm, what is its maximum speed when the engine is running at 3 480 rpm?
a. 28.4 m/s b. 14.2 m/s c. 56.9 m/s d. 7.11 m/s e. 3.55 m/s
An adjustable bracket with a collar slides on a pole and is held in place by friction at A and B. The min- imum coefficient of static friction between the pole and collar so that the collar is self-locking against the pole under applied load F is:
(A) 0.25
(B) 0.31
(C) 0.42
(D) 0.83
What would happen if the fusion rate in the core increased but the core could not expand?
A) The Sun's core would heat and the rate of fusion would increase further. B) The Sun's core would reach a new equilibrium, but at a higher temperature. C) The Sun's core would reach a new equilibrium, but at a cooler temperature. D) The Sun's core would cool and the rate of fusion would decrease.
Why does the riddle say that Earth is not in a special spot?
A: The Sun is at the center of the universe, but the Earth is not. B: The Big Bang explosion sent all material blasting away from the Earth. C: Hubble's law applies to some galaxies but not to others, so many planets besides Earth have their own Hubble's law. D: All space is expanding so Hubble's law would apply around all galaxies. E: Hubble measured the expansion law from the Moon, not from the Earth.