Unit: Motion in a plane.
Year: 1997 Question#: 60
Question: If the speed of the airplane is doubled and the radius of the path remains unchanged, the magnitude of the centripetal force acting on the airplane will be
(1 ) half as much
(2 ) twice as much
(3 ) one-fourth as much
(4 ) four times as much
What is this question really asking?
Explanation by: Erika M
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Answer 1
half as much
INCORRECT
Well, if the speed increases it's going to take more force to pull it in.
plug 2v in for v in this equation:
return to top
Answer 2
twice as much
INCORRECT
You forgot that it's a relationship of V2/r. Use the formula:
plug 2v in for v in this equation:
return to top Answer 3
one fourth as much
INCORRECT
Well, if the speed increases it's going to take more force to pull it in.
plug 2v in for v in this equation:
return to top Answer 4
four times as much
CORRECT
plug 2v in for v in this equation:
Therefore it's four times as much return to top
What's this question really asking?
It is asking if you can plug values into the equation for centripetal force. return to top
