What happens to the surface temperature and luminosity when gravity first assembles a protostar from a collapsing cloud?
A) Its surface temperature and luminosity increase.
B) Its surface temperature remains the same and its luminosity decreases.
C) Its surface temperature and luminosity decrease.
D) Its surface temperature decreases and its luminosity increases.
E) Its surface temperature and luminosity remain the same.
A
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The energy generated by the Sun is released by the _______ to make _______ nuclei
a. fusion of H nuclei; He b. fusion of He nuclei; H c. fission of H nuclei; He d. fission of He nuclei; H
Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. If there is no air resistance, the maximum height of Joe's ball will be
A) four times that of Bill's ball. B) two times that of Bill's ball. C) equal to that of Bill's ball. D) eight times that of Bill's ball. E) roughly 1.4 times that of Bill's ball.
The average temperature over the past 1000 years has been about 15?C?C. From the graphs, you can conclude that Earth's average temperature during the past 800,000 years has
A. varied between about 7?C and 19?C B. stayed remarkable steady, never varying by more than about 2?C C. never been as high as it is today D. varied between about ??10?C and +4?C
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The distance from the starting point in meters is
a. 0. b. 2. c. 4. d. 8. e. 16.