A Wind Farm Generator Uses a Two-Bladed Propeller Mounted on a Pylon

question 26

Multiple Choice

A wind farm generator uses a two-bladed propeller mounted on a pylon at a height of 20 m,as shown in the figure.The width of the pylon is very narrow,and the length of each propeller blade is 12 m.A tip of the propeller breaks off just when the propeller is vertical.The fragment flies off horizontally,falls,and strikes the ground at point P.Just before the fragment broke off,the propeller was turning uniformly,taking 1.2 s for each rotation.How far is point P from the base of the pylon if you neglect air?

• A)120 m
• B)130 m
• C)140 m
• D)150 m
• E)160 m

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Definitions:

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