An astronaut measures her mass by means of a device consisting of a chair attached to a large spring. The period of oscillation she undergoes when set into motion is used to determine her mass. If her mass together with the chair is 172 kg and the time required for her to undergo 10 full oscillations is 27 seconds, what is the spring constant?
A. 400 N/m
B. 931 N/m
C. 148 N/m
D. 467 N/m
B. 931 N/m
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A locomotive is pulling 9 freight cars, each of which is loaded with the same weight. The mass of each loaded car is 37000kg and we can neglect friction on these 9 cars. If the train is accelerating forward at 0
81m/s2 on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car.)
A given rope will break if its tension exceeds 360 N. Suppose that each of two people can exert a pull of 200 N. Which strategy below can they use to break that rope?
A. They each take an end and pull. B. They tie one end to the wall and both pull on the other. C. They use either of the strategies above. D. They cannot break the rope.
Two tuning forks with frequencies 264 and 262 Hz produce "beats". What is the beat frequency (in Hz)?
a. 4 b. 2 c. 1 d. 3 e. 0 (no beats are produced)
Venus is visible to us:
a) only during its new phase. b) only near sunrise or sunset. c) only in the summer. d) only in the winter. e) only during the several hours around midnight.