Amass m is attached to a string connected to a force sensor on a rotating platform. the platform’s angular velocity, ω, can be easily measured, but the linear velocity of the mass cannot. when the mass is at r = 0.20 m and rotates at a constant ω = 8.5 rad/s, a force sensor reads 4.8 n. what is the mass m?

The mass m is 0.332 kg or 332 gm

Explanation:

Given

The platform is rotating with angular speed ,

Mass m is moving on platform in a circle with radius ,

Force sensor reading to which spring is attached ,

Now for the mass m to move in circle the required centripetal force is given by

=>

Thus the mass m is 0.332 kg or 332 gm