A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field. If the proton's speed tripled, its time to go around its circular path would be
A) double.
B) one third.
C) triple.
D) one half.
E) the same.
E
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What do we mean by a runaway greenhouse effect?
A) a greenhouse effect that keeps getting stronger until all of a planet's greenhouse gases are in its atmosphere B) a greenhouse effect that starts on a planet but later disappears as gases are lost to space C) a greenhouse effect that heats a planet so much that its surface rock melts D) a process that heats a planet's surface, but that doesn't require the presence of greenhouse gases
A supernova that occurs 10,000 years from now in a galaxy 50,000 light years away:
A) will be observed on Earth 10,000 years from now. B) was observed on Earth 40,000 years ago. C) will be observed on Earth 40,000 years from now. D) was observed on Earth 50,000 years ago. E) will be observed on Earth 50,0000 years from now.
Scientists believe that large storms on Saturn are:
A) tied to Saturn's rings. B) in the high altitude ammonia clouds. C) only found at the equator. D) rooted deep in the atmosphere. E) in Saturn's troposphere.
The kinetic energy of a body is correctly given by which of the following expressions? (m=mass, v=speed)
A. mv2 B. mv C. (½)mv D. 2mv2 E. (½)mv2