Question: Derive the following formulas relating the load W and the force P exerted on the handle of the jack discussed in Section 8.6. (a) P

Derive the following formulas relating the load W and the force P exerted on the handle of the jack discussed in Section 8.6.
(a) P = (Wr/a) tan (θ + φs), to raise the load;
(b) P = (Wr/a) tan (φs + θ), to lower the load if the screw is self-locking;
(c) P = (Wr/a) tan (θ + φs) to hold the load if the screw is not self-locking.

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