A 600-kg car is going around a banked curve with a radius of 110 m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction?
A) 29.1°
B) 13.5°
C) 33.8°
D) 56.2°
E) 60.9°
Answer: A
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A spaceship of triangular shape, having a length three times its width, is capable of relativistic speeds. How fast would it have to move so that to a stationary observer its length would equal its width?
a. 0.333c b. 0.816c c. 0.943c d. 0.650c e. This is not possible.
Suppose that a certain saber-toothed-tiger contained one gram of 14C [half-life 6000 years] when it died. The approximate 14C content of the remains of this tiger 24,000 years later would be
A) zero grams. B) 1/8 gram. C) 1/32 gram. D) 1/16 gram. E) impossible to predict.
A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. Air resistance just before they hit is greater for the
A) regular ball. B) lead-filled ball. C) same for both
Which of the following rocks would be expected to have the coarsest-grained texture?
a) granite b) obsidian c) basalt d) pumice