What happens to an object supported by degeneracy pressure as the object cools with time?
A) The degeneracy pressure weakens and the object collapses.
B) The degeneracy pressure strengthens and the object expands.
C) The degeneracy pressure is unaffected by the temperature change, so the object remains stable.
C) The degeneracy pressure is unaffected by the temperature change, so the object remains stable.
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Moonquakes on the Moon were detected by:
A) the radar observations over time from Earth. B) the seismographs left these by the Apollo astronauts. C) laser beams reflected off mirrors left on the Moon by Apollo missions. D) seismographs attached to the Russian Lunar rovers. E) telescopic observations of lunar landslides.
What is 56 + ( 32.00)/(1.2465 + 3.45 ) written with the correct number of significant figures?
A) 62.8 B) 62.812 C) 62.81 D) 63 E) 62.8123846
According to the HST data, very distant (and early) galaxies tend to be
A) smaller, bluer, and more irregular than modern ones. B) redder, due to the recession of the universe. C) larger and bluer that modern galaxies. D) nothing but quasars. E) very well formed into clusters of nothing but spirals.
A ball is thrown straight up into the air. Its position at 7 instants of time are shown in the figure; the maximum height is reached at position 4. At which of the labeled points is the acceleration of the ball smallest?