In the H-R diagram, roughly 80 percent of all stars are
a. in the giant region.
b. in the supergiant region.
c. among the B stars.
d. among the G stars.
e. on the main sequence.
e
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A planet is much brighter than the star it orbits
a. True b. False Indicate whether the statement is true or false
Newton's modification of Kepler's Third law allows astronomers to determine the ________ of celestial objects.
A. period B. mass C. acceleration D. distance
Which rocket would require more fuel?
A) one going from the Moon to Earth. B) one going from Earth to the Moon. C) both the same.
We are able to define a mechanical equivalent for heat because
a. some thermal energy can be converted into mechanical energy. b. mechanical energy can be converted into thermal energy. c. work can be converted into thermal energy. d. some thermal energy can be converted into work. e. all of the above can occur.