A 60-kg skier starts from rest from the top of a 50-m high slope. If the work done by friction is -6.0 kJ, what is the speed of the skier on reaching the bottom of the slope?
A) 31 m/s B) 24 m/s C) 17 m/s D) 28 m/s
D
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Which of these objects would exhibit diffuse reflection if you shone a light on it?
a. A cactus. b. A mirror. c. A still pool of water. d. A polished table top. e. A window.
Very early in his thinking about relativity, Einstein asked himself what a person would observe if he or she kept up with a lightbeam. In answer to this question, the theory of relativity states that
A) this is not a valid question because a person cannot move as fast as a lightbeam. B) the light beam would stand still and so time would stand still. C) the observer would suddenly undergo a sex change. D) the observer own would continue to observe the same laws of physics. E) time would speed up without limit, and would pass at an "infinite" rate.
A circular space station (shaped like a big wheel) rotates 100 times in one hour. The apparent weight of an astronaut standing on the inside surface of the outer wall is equal to her weight on earth. How far from the axis of rotation is the inside surface of the station’s outer wall?
A. 322 m B. 102 m C. 56 m D. 1012 m
What scientist discovered more elements than any other person?
a. Lavoisier b. Boyle c. Berzelius d. Davy