If the Moon is setting at noon, then it rose at
A) 6 A.M.
B) 9 A.M.
C) noon.
D) 6 P.M.
E) midnight.
E) midnight.
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A key step in the destruction of ozone by chlorofluorocarbons is
A) the chlorofluorocarbon molecule separates, resulting in free carbon which produces a greenhouse effect. B) the chlorofluorocarbon molecule directly combines with atmospheric ozone. C) carbon atoms react with ozone. D) radiation from the sun separates chlorofluorocarbon, resulting in free chlorine. E) radiation from the sun breaks down O3 molecules.
A skydiver jumps out of a hovering helicopter. A few seconds later, another skydiver jumps out, so they both fall along the same vertical line relative to the helicopter. Both skydivers fall with the same acceleration. (Assume g is constant.) The difference in their velocities
1.increases. 2.decreases. 3.stays the same.
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 3sin(2x)cos(5t), where x is in m and t is in s. What is the wavelength of the interfering waves?
a. 3.14 m b. 1.00 m c. 6.28 m d. 12.0 m e. 2.00 m
Compared to the spirals, elliptical galaxies tend to be more dusty
Indicate whether the statement is true or false