Posted by **DL** on Thursday, December 10, 2009 at 9:29pm.

What is the angular momentum of a 2.4 kg uniform cylindrical grinding wheel of radius 12 cm when rotating at 1800 rpm?

How much torque is required to stop it in 4.0 s?

- Physics -
**drwls**, Friday, December 11, 2009 at 2:13am
Convert 1800 rpm to radians per second and call it w. (It texts, it's usually a Greek lower case omega)

The angular momentum is I w, where I is the moment of inertia. Use units of kg m^2/s

For a solid cylinder of mass M and radius R, I = (1/2) M R^2.

The torque L required to stop in time T is I w/T. The units will be newton meters or kg m^2/s^2 (same thing)

## Answer This Question

## Related Questions

- physics - What is the angular momentum of a 2.43 kg uniform cylindrical grinding...
- PHYSICS - What is the angular momentum of a 2.7 kg uniform cylindrical grinding ...
- physics help please!!! - What is the angular momentum of a 2.5 kg uniform ...
- Physic Angular momentum and torque - What is the angular momentum of a 1.0kg ...
- U. Phys - What is the angular momentum of a 3.7kg uniform cylindrical grinding ...
- physic angular momentum and torque - What is the angular momentum of a figure ...
- Physics - An electric motor rotating a workshop grinding wheel at a rate of 95 ...
- physics - An electric motor rotating a workshop grinding wheel at a rate of 9.80...
- Physic - An electric motor rotating a workshop grinding wheel at a rate of 114 ...
- Physics - 1.(a)When a record player is stopped, the turnabble initially rotating...

More Related Questions