Question

A stone tied to the end of a string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolution in 44 seconds, what is the magnitude and direction of acceleration of the stone?

(a) π² m s^-2 and direction along the radius towards the centre.

(b) π² m s^-2 and direction along the radius away from the centre.

(c) π² m s^-2 and direction along the tangent to the circle.

(d) π²/4 m s^-2 and direction along the radius towards the centre.

Answer 1

(a) π² ms^–2 and direction along the radius towards the centre.

Explanation:

a_r = ω² R

  a_net = a =π² ms^–2 and direction along the radius  towards the centre.