A boy flies a kite with the string at a 30digree angle to the horizontal. The te
ID: 2200207 • Letter: A
Question
A boy flies a kite with the string at a 30digree angle to the horizontal. The tension in the string is 4.5 N How much work does the string do on the boy if the boy stands still? Express your answer using two significant figures. How much work does the string do on the boy if the boy walks a horizontal distance of 11 m away from the kite? Express your answer using two significant figures. How much work does the string do on the boy if the boy walks a horizontal distance of 11 m toward the kite? Express your answer using two significant figures.Explanation / Answer
PART A
answer: None. The equation for work is W = force x distance. Since the boy isn't moving, the distance is zero. Anything times zero is zero
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PART B
answer: might be a trick question since his direction away from the kite and his velocity weren't noted. Perhaps he just set the string down and walked away 11m from the kite. If he did this, it is the same as the first one...no work was done by the sting on the boy.
If he did walk backwards with no velocity indicated, and held the string and it stayed at 30 deg the answer would be:
4.5N + (boys negative acceleration * mass) = total force1
work = total force1 x 11 meters
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PART C
answer: same as above only reversed:
4.5N - (boys negative acceleration * mass) = total force2
work = total force2 x 11 meters.
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