2 Answers

SangamAngre · Answer 1 · 2019-01-17T10:54:23+0000

It is given in the question that the end of a pendulum with a length of 21 cm travels an arc length of 24 cm.

So here radius is 21 cm and the arc length is 24 cm .

Now we use the arc length formula , which is

$s = r* \theta$

Where s is the arc length and r is the radius.

Substituting these values, we will get

$24 = 21 \theta \\ \theta = (24)/(21) \\ \theta = 1.143 radians$

And now we need to convert radian to degree, and for that we have to multiply by
$(180)/( \pi)$

That is

$1.143 * (180)/( \pi) =65.48 degree$

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