What part of the Sun's aging process will destroy Earth itself?
a. the fusion of hydrogen in the core
b. an increase in luminosity as the core becomes helium-enriched
c. the expansion of the outer layers of the Sun as a red giant
d. the supernova explosion caused by the collapse of the iron core
e. hydrogen detonation on the white dwarf remnant
c
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Why does the average chemical composition of stars now forming differ from that of older stars?
What will be an ideal response?
Compared to the recoiling cannon, a fired cannonball has a
A) greater momentum. B) greater kinetic energy. C) smaller speed. D) all of the above
A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick requires the force to be
A) just as much. B) 10 times as much. C) 100 times as much. D) one-tenth as much. E) none of the above
An electron, moving toward the west, enters a uniform magnetic field. Because of this field the electron curves upward. The direction of the magnetic field is
A) towards the south. B) upward. C) towards the west. D) towards the north. E) downward.