A violet-hot star emits radiation having about twice the peak frequency of radiation from a red-hot star. The surface temperature of the hotter star is about
A) half that of the cooler star.
B) twice that of the cooler star.
C) the same.
Answer: B
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Slanting Surfaces With Friction: A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about force of static friction f on the block?
A. f > mg B. f > mg cos ? C. f > mg sin ? D. f = mg cos ? E. f = mg sin ?
As seen in 1987, when two silicon 28 nuclei fuse, or when seven alpha particles are added to a Si-28 nucleus, the initial result in either case is:
A) the shedding of bipolar planetary nebula shells. B) a nova explosion. C) iron 56. D) cobalt 56. E) nickel 56.
The power consumed by a device drawing 0.8 A when connected to 120 V is
A) 12 W. B) 15 W. C) 60 W. D) 96 W. E) 120 W.
What do the orbits of halo and disk stars tell us about the formation of the Milky Way?
What will be an ideal response?