A solid disk with a radius of $5 m$ $5 m$ and mass of $4 k g$ $4 kg$ is rotating on a frictionless surface. If $15 W$ $15 W$ of power is used to increase the disk's rate of rotation, what torque is applied when the disk is rotating at $4 H z$ $4 Hz$ ?

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Answer 1 · 2017-02-09T19:40:42

$τ = \frac{15}{8 π} \approx 0.60 N \cdot m$ $tau=(15)/(8pi)~~0.60N*m$

We are told we have a rotating spinning coin.

http://www.mariowiki.com/coin

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

$τ = \frac{15}{8 π} \approx 0.60 N \cdot m$ $tau=(15)/(8pi)~~0.60N*m$

A solid disk with a radius of 5m5 m and mass of 4kg4 kg is rotating on a frictionless surface. If 15W15 W of power is used to increase the disk's rate of rotation, what torque is applied when the disk is rotating at 4Hz4 Hz?