This visible-light photo shows a starburst galaxy. What is going on with the reddish gas that seems to be emerging on both sides of it?
A) It is gas being blown out in a galactic wind.
B) It is gas from a protogalactic cloud that is still falling inward toward the galactic center.
C) The gas represents jets being shot out from the region of a supermassive black hole.
D) The gas consists of many individual stars that are bursting out from the central regions of the galaxy.
A) It is gas being blown out in a galactic wind.
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Two cars that have the same mass are moving around a circular track at the same constant speed. The track is perfectly level. If car 1 is at the inner edge of the track and car 2 is at the outer edge, then
A. the frictional force on car 1 is greater than the frictional force on car 2. B. the frictional force on car 1 is less than the frictional force on car 2. C. the frictional force on both cars is zero. D. the frictional forces on both cars are equal and greater than zero.
How does Mercury's rotation relate to the Sun?
A) Its rotation rate is 2/3 as long as its year, due to tidal resonances. B) Its day is the same length as its year. C) Its year is much shorter, only 88 days, than its slow rotation of 243 days on its axis. D) It always keeps one face tidally locked toward the Sun, as our Moon does with us. E) It does not spin at all, being tidal stopped by the solar tides.
Which statement illustrates the fact that two different theories can both agree with the same set of observations?
A) Nonsense--it is impossible for two different theories to both be correct. B) the theories of Ptolemy and Copernicus, before Tycho made his observations C) the theories of Copernicus and Kepler, after Tycho made his observations D) the theories of Galileo and Kepler E) the Earth-centered circular orbit theory of the early Greeks, and the later theory of Ptolemy
The change in entropy of 1.00 kg of water that is heated from 50°C to 100°C is (in cal/K)
a. 516 b. 312 c. 144 d. 946 e. 391