Two identical airplanes are executing identical turns around a pylon. One of them is moving at 200 mph, and the other is moving at 100 mph. The centripetal force acting on the airplane moving at 200 mph is __________ the value of the centripetal force acting on the airplane moving at 100 mph
a. one quarter b. one half
c. the same as d. twice
e. four times
e
RATIONALE: Centripetal force = mv2 / r; since v1 = 2v2 ; the force is (2)2 or 4 times as great.
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