Carcass wrote:
Attachment:
#greprepclub The figure above shows the path traced by the end of a pendulum.jpg
The figure above shows the path traced by the end of a pendulum as it moves from point X to point Y. How many centimeters does the end of the pendulum travel along the arc from X to Y?
(A) \(4\pi\)
(B) \(5\pi
\)
(C) \(10\pi\)
(D) \(20\pi\)
(E) \(36\pi\)
Kudos for the right answer and explanation
The arc formed is a part of a circle having angle at the center as \(30^o\) and radius \(r = 120 \)cm
For the full circle (center angle \(360^o\)), the arc length = circumference = \(2 * \pi * r = 240 * \pi\)
Thus, for \(30^o\), length of the arc = \((240 * \pi) * 30/360 = 20\pi\)
Answer D