A child is twirling a 0.0165-kg ball on a string in ahorizontal circle whose rad

Question

A child is twirling a 0.0165-kg ball on a string in ahorizontal circle whose radius is 0.130 m. The ball travels oncearound the circle in 0.649 s. (a) Determine thecentripetal force acting on the ball. (b) If thespeed is doubled, by what factor does the centripetal forceincrease?
This would be the third time i ask for this question and noonle seems to get it right for part b. Please can someone help andgive me the right answer for part b and also give the right unitfor it cause its not N. Thanks A child is twirling a 0.0165-kg ball on a string in ahorizontal circle whose radius is 0.130 m. The ball travels oncearound the circle in 0.649 s. (a) Determine thecentripetal force acting on the ball. (b) If thespeed is doubled, by what factor does the centripetal forceincrease?
This would be the third time i ask for this question and noonle seems to get it right for part b. Please can someone help andgive me the right answer for part b and also give the right unitfor it cause its not N. Thanks

Explanation / Answer

Mass m = 0.0165 kg

Radius r= 0.13 m

Period T = 0.649 s

Angular speed w = 2 ( pi ) / T

                            = 9.681 rad / s

Centripetal force F = mrw ^ 2

                               = 0.201 N

(b). Speed v ' = 2v

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