Question

- A 2.0 kg ball is attached to the end of a 1.6 m string and
spins in a vertical circle.
- What is the weight of the ball?
- Find the velocity if the centripetal force is four times the weight.

Answer #1

Given that,

mass of ball (m)= 2kg

length of string=radius of vertical ball (r)= 1.6m

A. Weight of the ball (W)= mg ........... (it always act downward irrespective of the position of the ball )

Where, g= gravitational force =9.81 m/s2

therefore, W=m*g=2*9.81= 19.62 N

B.

Since we have given the condition that our centripetal force = 4 times the weight of the ball

so that according to the formula we have,

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