What do retro reflectors do?
a. Serve as a substitute for tail lights on cars.
b. Cause light to pass through a mirror instead of reflecting it back.
c. Cause light to reflect back in a straight line parallel to the direction it hits the mirror.
d. Change the color at which light reflects back from a mirror by using filters.
e. Cause the light to reflect at a right angle to the direction it hits the mirror.
c
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An isolated black hole will
A. eventually suck in all of the universe. B. not change in any way. C. implode due to its own gravity. D. slowly evaporate away through the emission of Hawking radiation.
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The distance from the starting point in meters is
a. 0. b. 2. c. 4. d. 8. e. 16.
Toss a baseball bat into the air and it wobbles about its
A) geometrical center. B) center of mass. C) heavier end.
Which of the following is the largest?
a. the diameter of Earth b. the diameter of the Moon c. the diameter of the Sun d. the diameter of Jupiter e. the distance from Earth to the Sun