Physics 313 Midterm Exam 1 Name 12) A wind farm generator uses a two-bladed prop

Question

Physics 313 Midterm Exam 1 Name 12) A wind farm generator uses a two-bladed propeller (see figure) mounted on a pylon at a height of 20 m. The length of each propeller blade is 12 m. A small piece from the tip of the propeller breaks off when the propeller is vertical. At that instant, the period of the motion of the propeller is 1.2 s. The fragment flies off horizontally, falls with negligible air resistance strikes the ground atP (a) How far is point P from the base of the pylon? at P? t as it strikes the ground Lem ch12m 20 2.

Explanation / Answer

here,

v0x = 60 m/s

v0y = 175 m/s

time taken , t = 40 s

let the height of cliff be h

h = - v0y * t + 0.5 * g * t^2

h = - 175 * 40 + 0.5 * 9.8 * 40^2

h = 840 m

the height of the cliff is 840 m

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