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

The combination of an applied force and a frictional force produces a constant total torque of 39.9Nm on a wheel rotating about a fixed axis. The applied force acts for 4.5s, during which time the angular speed of the wheel increases from 3 rad/s to 12 rad/s. The applied force is then removed. The wheel comes to rest in 72s.

A. What is the moment of inertia of the wheel? Answer in units of kgm^2

B. What is the magnitude of the frictional torque? Answer in Nm

C. What is the total number of revolutions of the wheel?

2. Relevant equations

[tex]\sum[/tex][tex]\tau[/tex] = I(moment of inertia) * [tex]\alpha[/tex]

3. The attempt at a solution

A. 39.9 = 2I

I = 19.95

That is correct.

B. T = (19.95)(9/72) = 2.49375

That is incorrect. What am I doing wrong?

C. I need some help, do not know where to start.

Thanks in advance.

Sorry if the equations look bad. This the first time I am using Latex and I still don't know exactly how to use it correctly.

**Physics Forums - The Fusion of Science and Community**

# Moment of Inertia and torque?

Know someone interested in this topic? Share a link to this question via email,
Google+,
Twitter, or
Facebook

Have something to add?

- Similar discussions for: Moment of Inertia and torque?

Loading...

**Physics Forums - The Fusion of Science and Community**