An object has kinetic energy when it is __________
Fill in the blank(s) with correct word
moving
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In the figure given below. Point a is a distance R from the electron, but point b is only 
from the electron. At which point is the magnitude of the magnetic field the largest?
A. Point a
B. Point b
C. The field has the same magnitude at both points.
Using the ideas discussed in your textbook, in what sense are we "star stuff"?
A) Movie stars and other people are all made of the same stuff, so we all have the potential to be famous. B) The overall chemical composition of our bodies is about the same as that of stars. C) We could not survive without light from our star, the Sun. D) Nearly every atom from which we are made was once inside of a star.
You are studying a mystery companion to an evolved star, with mass transfer happening. Which of the following properties suggests that the companion is definitely a black hole?
A) The mystery companion has a mass of over 1.4 solar masses. B) The mystery companion has a mass of over 3 solar masses. C) The mystery companion has an X-ray emitting accretion disk. D) The mystery companion gives off periodic X-ray bursts.
The process that effectively regulates Earth's average temperature is
a. the greenhouse effect. b. Rayleigh scattering. c. the dew point. d. auroras.