A solid disk with a radius of $3 m$ and mass of $9 kg$ is rotating on a frictionless surface. If $120 W$ of power is used to increase the disk's rate of rotation, what torque is applied when the disk is rotating at $8 Hz$ ?

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Answer 1 · 2017-02-09T19:49:57

$tau=(120" W")/(16pi)~~2.39N*m$

We are told we have a rotating spinning coin.

![http://www.mariowiki.com/coin]( useruploads.socratic.org )

Step 1. Gather the information that you know and need

Step 2. Determine the formula using the above givens

Step 3. Plug your answer into the formula for torque

$tau=(120" W")/(16pi)~~2.39N*m$

A solid disk with a radius of 3 m3 m and mass of 9 kg9 kg is rotating on a frictionless surface. If 120 W120 W of power is used to increase the disk's rate of rotation, what torque is applied when the disk is rotating at 8 Hz8 Hz?