Question

Let the disturbing mass be 200 kg and the radius of rotation be 20 cm and the rotation speed be 50 rad/s, then calculate the centripetal force in kN.

(a) -50

(b) -25

(c) -100

(d) -2500

I had been asked this question in class test.

Question is taken from Balancing of a Single Rotating Mass By a Single Mass Rotating in the Same Plane topic in portion Balancing of Rotating Masses of Machine Dynamics

Answer 1

Right choice is (c) -100

For explanation: Centripetal force is given by the equation

Fc = – mω^2r

This is the negative of the centrifugal force.

using the given data

Fc = -100000 N.