A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
a. 2.8
b. 1.7
c. 1.3
d. 4.0
e. 1.0
c
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You find yourself in a place that is unimaginably hot and dense. A rapidly changing gravitational field randomly warps space and time. Gripped by these huge fluctuations, you notice that there is but a single, unified force governing the universe
Where are you? A) You are floating somewhere in the universe near its end, 10100 years from now. B) You are in the center of a young star. C) You are in the universe shortly after inflation. D) You are inside the nucleus of an atom. E) You are in the early universe before the Planck time.
Describe the large impact theory of the Moon's origin
What will be an ideal response?
John rapidly pulls a plunger out of a cylinder. As the plunger moves away, the gas molecules bouncing elastically off the plunger are
a. rebounding at a higher speed than they would have if the plunger weren't removed. b. rebounding at a lower speed than they would have if the plunger weren't removed. c. rebounding at the same speed as they would have if the plunger weren't removed. d. Whether they speed up or slow down depends on how fast the plunger is removed.
Which of these is a likely source of strong gravity waves?
a. The Earth. b. The Sun. c. A supernova. d. Nuclear fission. e. Nuclear fusion in stars.