A uniform solid cylinder Figure of mass M is supported on a ramp that rises at an angle θ T above the horizontal by a wire that is wrapped around its rim and pulls on it tangentially parallel to the ramp (Fig. 11.43).
(a) Show that there must be friction on the surface for the cylinder to balance this way.
(b) Show that the tension in the wire must be equal to the friction force, and find this tension.

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