At an altitude of 5 times the radius of the Earth, the acceleration due to gravity is
a. g/5.
b. 5g.
c. g/25.
d. not given.
c
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Evidence for the loss of water from the atmosphere of Venus via the action of ultraviolet light comes from the
A) observation of auroras high in the Venusian atmosphere caused by the action of ultraviolet light on water molecules B) fact that today, water is found only in the upper atmosphere of Venus C) observation of an ozone layer in the atmosphere which is formed from the breakup of water molecules by ultraviolet radiation D) observation of an excess of heavy hydrogen (deuterium) atoms in the atmosphere which are less easily able to escape once the water is broken apart
A baseball leaves the bat with a speed of 47 m/s and an angle of 45° above the horizontal. A 5.0-m-high fence is located at a horizontal distance of 137 m from the point where the ball is struck. Assuming the ball leaves the bat 1.0 m above ground level, by how much does the ball clear the fence?
a. 59.7 m b. 47.7 m c. 49.7 m d. 121 m
A relationship such as 1 in. = 2.54 cm is a(n)
a. equivalence statement. b. base unit. c. derived unit. d. fundamental quantity.
As air rises, it expands. It expands because it moves to
A) a region of higher air pressure. B) a region of lower air pressure. C) an area of greater humidity. D) an area of cooler air temperature.