Which feature of Neptune is most responsible for its blue color?
A. auroral activity due to its strong magnetic field
B. large oceans covering most of the surface
C. methane in its atmosphere
D. excess energy emitted by the interior
E. winds blowing at speeds almost that of sound
Ans: C. methane in its atmosphere
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What fraction of the solar system's mass is in the Sun?
a) About 50% b) About 99% c) About 10% d) Less than 1% e) About 75%
Burl and Paul have a total weight of 1300 N. The tensions in the supporting ropes that support their scaffold add to 1700 N. The weight of the scaffold itself must be
A) 300 N. B) 400 N. C) 500 N. D) 600 N.
M31 in Andromeda is a bigger version of our Galaxy, and the largest member of the Local Group
Indicate whether the statement is true or false
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide but still 5 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.