Question

The tip of a pendulum of 40 cm describes an arc of 20 cm. Though what angle does the pendulum swing​

Answer 1

90/π degree

Explanation:

length of arc, l= 20cm

length of pendulum, r= 40cm

let the angle be a:

we know that , r *a=l

40*a=20

a= 20/40=1/2 radian

= 1/2*(360/2π)=90/ π degree