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

a)-The massive grinder for wood-pulp in a newsprint paper factory, which can render about a half Tonne of wood into a thin soup in less than a minute, is essentially a stone cylinder of radius 0.900 m and mass about 6.00 Tonnes. An enormous motor spins this cylinder on its axis while hydraulic cylinders press the pocket of wood against its rim. A typical rotational speed for the motor is 62.0 rpm (rotations per minute). Suppose that while the paper plant is in full operation there is a power outage due to an ice-storm. How much energy (in J) is available to grind wood just from the rotational kinetic energy of the grinding wheel?

I HAVE ALREADY SOLVED PART a,

NEED HELP WITH B:

b)-If the grinding wheel comes to rest in 80.0 ms what is the tangential force (in N) that the wood presents to the grinding wheel if this force is constant during the slowing down?

2. Relevant equations

KE = 1/2Iw^{2}

F = ∆p/∆t ...?

t = Fr

∆w/∆t = α

3. The attempt at a solution

honestly don't know where to start.

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

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!

# Homework Help: Tangential Force Required to Slow Cylinder to a rest?

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