A ball is thrown straight upward from ground level with a speed of How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s
B) 1.8 s
C) 1.1 s
D) 0.6 s
A
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The quantity Z in the expression 
must be
A. always greater than 1. B. always less than 1. C. It could be either greater than or less than 1.
Movement of air aloft can influence surface air pressure; sometimes air aloft piles up—it converges—causing the surface air pressure to
A) increase and surface winds to blow away from the center of highest pressure. B) decrease and surface winds to blow away from the center of high pressure. C) increase and surface winds to blow away from the center of low pressure. D) decrease and surface winds to blow away from the center of lowest pressure.
A spaceship with a mass of 20,000 kg is traveling in a straight line at a constant speed of 300 km/s in deep space. Its rockets engines must be: (A) off or (B) firing?
A. off B. firing
What element is oxidized in the following equation and what element is reduced?
SN2 + 2 Ag ? Sn + 2 Ag? A) The tin ion, SN2 , is oxidized, while the silver, Ag, is reduced. B) The tin ion, SN2 , is reduced, while the silver, Ag, is oxidized. C) Both the tin ion, SN2 , and the silver, Ag, are reduced. D) Both the tin ion, SN2 , and the silver, Ag, are oxidized.