CIRCULAR MOTION FROM PATEL, please help. (1 Viewer)

[jmromeo]

A smooth circular disc of radius 0.25m rotates in a horizontal plane with angular velocity W=10rad/s about a vertical axis throgh the centre O. A particle of mass m is attached at P by light inelastic strings to points M and N on the ends of the diameter of the disc, such that MP=0.4m, NP=0.3m and both strings remain taut. Find the tension in the string NP, and the mass m if the tension in MP is 20N.

Answers: Tension in MP = 15 N

mass = 1 Kg.

I cannot get the right answers!

 

[lolokay]

lol 2 threads for this?

3unitz: i originally interpreted it how you did, but the question is trying to say that the particle is at the edge of the disc, such that the triangle MNP is in the horizontal plane, with gravitational force not needing to be considered (this gives the answers provided)