If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror:
a. depends on both the height of the man and the distance from the man to the mirror.
b. is equal to the height of the man.
c. is equal to one-half the height of the man.
d. depends on the distance the man stands from the mirror.
C
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If an applied stress is equal in three perpendicular directions, the stress is _____________.
Fill in the blank(s) with the appropriate word(s).
For a projectile launched horizontally, the horizontal component of a projectile's velocity
A) is zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases. E) any of the above, depending on position.
If the Universe had ________, that would resolve Olbers' paradox.
A. sources of new matter, like white holes B. more mass than electromagnetic radiation C. more electromagnetic radiation than mass D. a finite age E. an infinite extent
A planet is discovered at a distance of 1 AU from its parent star with a period of 2 years. How does the star's mass compare to our Sun's?
A. The star's mass is around 2 times smaller than the Sun's. B. The star has the same mass as the Sun. C. The star's mass is around 4 times larger than the Sun's. D. The star's mass is around 2 times larger than the Sun's. E. The star's mass is around 4 times smaller than the Sun's.