You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is
A) exactly 1500 N only if the box does not move.
B) exactly 1500 N whether or not the box moves.
C) greater than 1500 N if the box moves.
D) less than 1500 N if the box moves.
E) greater than 1500 N if the bat bounces back.
B
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Two equal charges, each Q, are separated by some distance. What third charge would need to be placed half way between the two charges so that the net force on each charge would be zero?
a. ?Q b. ?Q/2 c. ?Q/4 d. ?Q/8
A drop in pressure is an indication of
A) an approaching cold front. B) orographic lifting. C) adiabatic expansion. D) a stationary front.
Standing at the shore of a still lake, the reflected view of scenery on the far side of the lake is the view you would see if you were upside down with your eye in the line of sight
A) where it presently is. B) at the surface of the water where the light reflects. C) directly beneath you, as far below water level as you are above. D) close to the distant shore. E) none of the above
A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same. b. increases. c. decreases. d. doubles every 4.0 seconds.