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 with negligible air resistance. 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?

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

Question

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 with negligible air resistance. 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?

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

Quizplus · Accepted Answer

The Answer of 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 with negligible air resistance. 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?

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

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