The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars fusing hydrogen in their cores?
A) a
B) b
C) c
D) d
E) e
A) a
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How fast is a galaxy at a distance of 3000 Mpc receding from us?
A: 216,000 km/s B: 3000 km/s C: 2400 km/s D: 24 km/s E: 24,000 km/s
You would expect millisecond pulsars to be:
A) part of a binary system. B) isolated in space. C) rotating slowly. D) most common in open clusters. E) collapsing rapidly.
Which type of force would be the equal and opposite force to a gravitational force?
a. gravitational b. electromagnetic c. strong d. weak e. It could be any one of the above or some combination of them.
A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, the person's power output is 1,200 W
Indicate whether the statement is true or false