When Nellie Newton hangs by the ends of a rope draped over a large pulley, the tension in each supporting vertical strand is
A) half her weight.
B) equal to her weight.
C) twice her weight.
D) none of the above
Answer: A
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Which of the following is evidence of past internal activity on Mercury?
A. Vents B. "the Spider" C. "Hollows" D. Scarps E. All of these choices are correct
Consider a large molecular cloud that will give birth to a cluster of stars. Which of the following would you expect to be true?
A) A few massive stars will form, live, and die before the majority of the star's clusters even complete their protostar stage. B) All the stars in the cluster will be of about the same mass. C) All the stars in the cluster will become main-sequence stars at about the same time. D) All the stars in the cluster will have approximately the same luminosity and surface temperature.
If the wavelength of light in Young's two-slit experiment is decreased, which one of the following statements is true of the interference pattern?
A) The distance between the minima stays the same. B) The distance between the maxima decreases. C) The distance between maxima stays the same. D) The distance between the maxima increases. E) Impossible to tell without knowing the separation between the slits.
Headward erosion of a group of cirques around a mountain may produce
A) glacial lakes. B) an arete. C) a horn. D) a hanging valley.