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# Physics: Calculate amount of torque required to keep a cylinder rotating

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A cylinder of mass M and radius R is rotated in a uniform V grove (which looks like a rectangular block with an 45-45-90 degree triangular prism cut from the center- that the cylinder rotates in) The cylinder has a constant angular velocity w and a coefficient of friction u with each surface. What torque must be applied to the cylinder to keep it rotating?

Hint: If u=0.5, R=0.1m, W=100N then torque=5.7 Nm

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First, we need to solve for friction, f, on the ...

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