(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

What is the angular momentum of a figure skater spinning (with arms in close to her body) at 3.32 revolutions per second, assuming her to be a uniform cylinder with a height of 1.41 m, a radius of 13.4 cm, and a mass of 50.4 kg.

How much torque is required to slow her to a stop in 4.57 s, assuming she does not move her arms?

2. Relevant equations

I= (M x R^2) /2

3. The attempt at a solution

I got the first one, the angular momentum

since I= (M x R^2) /2

and w = 3.32*2∏

L = Iw

9.4 kg*m^2/s

ang acc is total change in ang vel divided by total time for uniform angular acceleration

α= w/4.57

torque = Iα

torque = 2.065N*m

but its wrong

anyone can help pls? 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!

# Torque required to slow down an object

Can you offer guidance or do you also need help?

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