Question

An object of mass 5 kg is rotated in a horizontal plane by means of a string of length 2 m. Find the centripetal
force if the object is rotated with a constant speed of 3 ms!
(1) 12.5 N
(2) 20.5 N
(3) 22.5 N
(4) 32.5 N
Anh​

Answer 1

Answer:

centripetal force=(mv²)/r=(5×9)/2=22.5N

so answer is option 3

Answer 2

Answer:

(3) 22.5 N

Step-by-step explanation:

Given that:

Mass= 5Kg

Velocity= 3ms

Radius= 2m

To find: Since the object of 5kg is being constantly rotated on a horizontal plane of 2m radius at a speed of 3ms, we have to find the centripetal force of the object.

Hence,

Centripetal force (N)= (mv^2)/r

This formula can be broken down as:

N = (Mass x (Velocity^2)/ Radius

Therefore:

- N= (5 x (3^2))/2

- N= (5 x 9)/2

- N= 45/2

- N= 22.5

Hence, when an object of 5Kg is rotated on a plane of radius 2m at a speed of 3ms, the centripetal force shall be 22.5N

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