The ____________________ are theories that unify the electromagnetic, weak and strong forces at extremely high energies
Fill in the blank(s) with correct word
grand unified theories
GUTs
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A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is
a. 0 N. b. 201 N. c. 211 N. d. 553 N. e. 580 N.
No object produces a perfect thermal radiation spectrum, but many objects produce close approximations. Which of the following would not produce a close approximation to a thermal radiation spectrum?
A) a hot, thin (low-density, nearly transparent) gas B) a filament in a standard (incandescent) light bulb C) a star D) you
Two electric charges +Q and -Q, are separated by a distance d. If you make a graph of the electric potential as a function of the distance along the line connecting the two charges, the point exactly midway between the two charges would
A) be a relative maximum. B) be a relative minimum. C) be neither a relative maximum nor a relative minimum. D) oscillate between being a relative maximum and a relative minimum.
Stars in a constellation ________.
A. are close to one another in space B. neither rise nor set C. are in the same direction in the sky D. all formed at about the same time E. None of these choices is correct.