- #1

AstroturfHead

- 6

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This is a problem I'm having a world of problem with:

A. What is the angular momentum of a 2.56 kg uniform cylindrical grinding wheel of radius 17.5 cm when rotating at 1480 rpm?

Correct: 6.08 kg*m^2/s

B. How much torque is required to stop it in 6.50 s?

So after 5 tries, I get that Torque = Moment of Inertia * Alpha.

Alpha = Delta (w)/ Delta (t)

Then I = 1/2*m*r^2

and I get .9347 N*m, but the computer does not. Any suggestions as to what I am doing wrong?

A. What is the angular momentum of a 2.56 kg uniform cylindrical grinding wheel of radius 17.5 cm when rotating at 1480 rpm?

Correct: 6.08 kg*m^2/s

B. How much torque is required to stop it in 6.50 s?

So after 5 tries, I get that Torque = Moment of Inertia * Alpha.

Alpha = Delta (w)/ Delta (t)

Then I = 1/2*m*r^2

and I get .9347 N*m, but the computer does not. Any suggestions as to what I am doing wrong?

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