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Question
Find the angle in radian through which a pendulum swings if its length is 75 cm and the tip describes an arc of length
15 cm
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Solution
We know:
Radius = 75 cm
Length of the arc = 15 cm
Now,
\[\theta = \frac{\text{Arc }}{\text{Radius}}\]
\[ = \frac{15}{75}\]
\[ = \frac{1}{5}\text{ radian }\]
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