A muon formed high in Earth's atmosphere travels at a speed 0.960c for a distance (as we see it) of 4500 m before it decays. How far does the muon travel as measured in its frame?
a. 2520 m
b. 16,100 m
c. 4320 m
d. 1260 m
e. 4500 m
d
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Regarding the validity of Ptolemy's and Copernicus' theories:
A) Ptolemy was proven wrong and Copernicus was proven right. B) they were both good theories, but Ptolemy's point of view ultimately turned out to be more useful. C) the experimental facts known in Copernicus' time tended to support Copernicus' theory over Ptolemy's. D) they were both wrong and useless theories. E) they were both good theories, but Copernicus' point of view ultimately turned out to be more useful.
The eye changes its f-number by
a. using the iris to change the size of the pupil. b. using the ciliary muscle to change the focal length of the lens. c. Both a & b are correct. d. The eye does not change its f-number.
A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N which is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the magnitude of the acceleration of the block?
A) 0.528 m/ B) 0.158 m/ C) 0.412 m/ D) 0.983 m/ E) 0.260 m/
The type of energy that a swinging pendulum has at the high point of its swing is
A) thermal. B) kinetic. C) spiritual. D) elastic. E) gravitational.