Find the angle in radian though which a pendulum swings if its length is 75 cm and the tip describes an arc of length (i) 10 cm (ii) 15 cm (iii) 21 cm
Solution:
(i) r = 75cm
length of arc, l = 10cm
The angle Ѳ =?
We know that,
(ii)
r = 75cm
length of arc, l = 15cm
(iii)
length of arc, l = 21cm
