Which direction do a comet's dust and plasma tails point?
A) straight behind the comet in its orbit
B) generally away from the Sun
C) perpendicular to the ecliptic plane
D) always almost due north
B
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Magnetic Poles: A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will
A. contain only a north pole. B. contain a north pole on the right and a south pole on the left. C. contain only a south pole. D. no longer contain any poles.
A stretch of land is 12.5 km long on a map
(a) What would be its length to an observer moving by, parallel to the stretch, at 0.95c? (b) Which length is the proper length? (c) How fast must the observer move for the land to appear 6.50 km long?
The Leonid meteor shower occurs in mid-November. Which of the following statements regarding the Leonids is true?
A. The shower is best observed very early in the morning, before dawn. B. The radiant of the meteor shower is in the constellation of Leo. C. The shower occurs when Earth crosses the path of an old comet. D. All of these choices are correct.
A horizontal curve on a bobsled run is banked at a 45° angle. When a bobsled rounds this curve at the curve's safe speed (no friction needed to stay on the run), what is its centripetal acceleration?
A) 1.0 g B) g C) g / D) 2.0 g E) 0.5 g