If the direction of rotation is changed to clockwise instead

If the direction of rotation is changed to clockwise instead of counterclockwise, what angular acceleration would cause a normal force to be exerted on block B from the top of the bar, instead of the bottom of the bar for your mB? If there is friction between block B and the arm OA. b) What friction coefficient is required to stop the block from sliding in the radial direction for your given clockwise angular acceleration if V = 1 m/s?

Solution

A thin-walled closed tube has the cross-section shown. The midline is a circle of radius R. The wall thickness varies linearly with theta from t = t0 at theta = 0 to t = 3t0 at theta = pi. Find the torsional stiffness, T/theta using Bredt\'s formula.