(adsbygoogle = window.adsbygoogle || []).push({}); The problem statement, all variables and given/known data

Energy is to be stored in a flywheel in the shape of a uniform solid disk with a radius of = 1.30m and a mass of 66.0kg . To prevent structural failure of the flywheel, the maximum allowed radial acceleration of a point on its rim is 3600m/s² .

What is the maximum kinetic energy that can be stored in the flywheel?

The attempt at a solution

I took I = 3/2MR² (at rim)

where R = 2.6m

Then K = 1/2 * I * ω², where ω² = a/R

so K = (1/2)(3/2)(66kg)(2.6m)²(3600/2.6) = 463320J

which is wrong..

The ans is 7.72x10^4 J

can someone pls tell me where i gone wrong?

Thanks!!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Rotational KE problem

**Physics Forums | Science Articles, Homework Help, Discussion**