Wed March 28, 2012 By: Minu Joseph

Find the angle in radian through which a pendulum swings if its length is 75 cm and the tip describes an arc of length 30 cm. A.2.25 radians B.22.5 radians C.2.5 radians D.2.8 radians Correct Correct Answer: C .how can the ans be 'c' ?

Expert Reply
Wed March 28, 2012
We know that in a circle of radius r units, if an arc of length l units subtends an angle theta radian at the centre, then theta = l/ r.
Here, r = 75 and l = 30
Thus, theta = 30/ 75 radians = 0.4 radians
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