Question

Find the angle in radian through which a pendulum swings and its length is $75\, cm$ and tip describes an arc of length $21 \,cm$.

• A. $7/25$
• B. $6/25$
• C. $8/25$
• D. $3/25$

Answer 1

Answer: (A)

$7/25$

Answer 2

Given, length of pendulum $= 75 \,cm$ Radius $(r) =$ length of pendulum $= 75\, cm$ Length of arc $(l) = 21 \,cm$ Now, $\theta=\frac{l}{r}=\frac{21}{75}$ $=\frac{7}{25}$ radian