Question

a ball rotating in a circular path of radius 20 cm makes 70 revolutions in 22s find the centripetal acceleration

Answer 1

Explanation:

r = 20/100 m = 0.2m

d = total distance covered = 70* circumference of circle

= 70 * 2πr = 140 * π * 0.2 = 28π metre

v = speed = d/t = 28π / 22 = (28* 22)/(22*7) = 4 m/s

(π=22/7)

So, centripetal acceleration = v²/r = 4²/0.2 = 80 m/s²