Two forces produce equal impulses, but the second force, F2, acts for a time twice that of the first force, F1. Which force, if either, is larger?
A. F1
B. they are the same
C. F2
A. F1
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Spherical Mirrors: A negative magnification for a mirror means that
A. the image is inverted, and the mirror could be either concave or convex. B. the image is upright, and the mirror is convex. C. the image is inverted, and the mirror is convex. D. the image is inverted, and the mirror is concave. E. the image is upright, and the mirror could be either concave or convex.
Suppose you drop a 10-pound weight and a 5-pound weight on the Moon, both from the same height at the same time. What will happen?
A) Both will hit the ground at the same time. B) The 10-pound weight will hit the ground before the 5-pound weight. C) The 5-pound weight will hit the ground before the 10-pound weight. D) Both weights will float freely because everything is weightless on the Moon.
The color of light that is LEAST useful for the growth of green plants is:
a. Red b. White c. Blue d. Green
You start with a sample of 14C that contains 200 atoms. After three half-lives, how many atoms of 14C will be left?
A. 25 B. 50 C. 75 D. 100 E. 150