Which is the correct expression for the force of static friction, where n is the normal force?
a. fs < ?sn
b. fs ? ?sn
c. fs > ?sn
d. fs ? ?sn
b
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Determine the magnitude and sense (direction) of the current in the 10-? resistor when I = 1.8 A.
A. 1.6 A right to left B. 1.6 A left to right C. 1.2 A right to left D. 1.2 A left to right E. 1.8 A left to right
Assuming negligible friction, what spring constant would be needed by the spring in a "B-B gun" to fire a 10-g pellet to a height of 100 m if the spring is initially compressed by 0.10 m?
A) 20 N/cm B) 20 N/m C) 200 N/m D) 2000 N/cm E) 0.0020 N/m
When a light ray in air enters water at 15° from the normal, it
A) always bends toward the normal. B) always bends away from the normal. C) sometimes bends towards or away from the normal. D) does not bend.
A ball is thrown straight upward with an initial speed of 30 m/s. Assuming there is no air resistance, how high does the ball go before falling back down?