The Moon's synodic period is longer than its sidereal period
a. True
b. False
Indicate whether the statement is true or false
True
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What becomes of the heavy elements produced by fusion in low-mass stars?
A. When the star goes supernova, they are sucked into the neutron star or black hole. B. They are blasted outward in a violent explosion. C. At the end of the star's life, they are dredged up by convection and pushed outward by photons. D. They are forever trapped in the core of the star. E. Low-mass stars do not produce heavy elements.
A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her moment of inertia decreases by 1/2. Her angular speed increases by a factor of
A) 2. B) 4. C) . D) 1 E) 1/2.
The additional energy given off by active galaxies is because of their higher stellar density
Indicate whether the statement is true or false
Which of the following best describes the nature and origin of the atmospheres of the Moon and Mercury?
A) They have thin exospheres only, with gas coming from impacts of subatomic particles and photons. B) They have thin tropospheres only, with gas coming from vaporization. C) They have only small amounts of gas, all of which is left over from outgassing long ago. D) They have thin atmospheres produced by outgassing, but still have the layers of a troposphere, thermosphere, and exosphere.