A point charge Q is placed on the x axis at x = ?2.0 m. A second point charge, ?Q, is placed at x = 1.0 m. If Q = 60 ?C, what is the magnitude of the electrostatic force on a 40-?C charge placed at the origin?
a. 16 N
b. 27 N
c. 32 N
d. 11 N
e. 3.0 N
b
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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
What prevents gravity from pulling you through the ground to the center of the Earth? Choose the best answer
1.The density of matter is too great. 2.The positive nuclei of your body’s atoms repel the positive nuclei of the atoms of the ground. 3.The density of the ground is greater than the density of your body. 4.Atoms are bound together by chemical bonds. 5.Electrons on the ground’s surface and the surface of your feet repel one another.
How do observations of distant galaxies help us learn about galaxy evolution?
A) Observations at different distances show galaxies of different ages and therefore different stages of evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can observe two galaxies merging and what the result is, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
The rainy monsoonal climate of the Tibetan highlands results from
A) strong off-shore winds in the summer. B) a strong temperature contrast and pressure gradient from warm air over the highlands and cool air over the oceans. C) a strong temperature contrast and pressure gradient from cool air over the highlands and warm air over the oceans. D) none of these