Please Show All Work. A clipboard that is used for holding and writing on paper

Question

Please Show All Work.

A clipboard that is used for holding and writing on paper is shown. The clamp ABC has a torsional spring a pin C with stiffness Kt = 2 in lb /rad. To release the clamp so that paper may be inserted or removed, the user applies a verticle force P. Determine the pretwist of the torsional spring(in terms of number of turns) so that the clamp provides a clamping force of 4lb at point A when P = 0, and determine the force P needed to release the clamp. Assume the contact at A is frictionless.

P= ? lb

Theta= ? turns

Explanation / Answer

Please Show All Work. A clipboard that is used for holding and writing on paper

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