Solve for the required value of the force P to raise the load if (a) the coefficient of static friction between the wedge and the ground is 0.20 in the absence of the rollers, and (b) the rollers exist as can be seen in the picture

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High-strength bolts are used in the construction of many steel structures. For a 1-in.- nominal-diameter bolt, the required minimum bolt tension is 51 kips. Assuming the coefficient of friction to be 0.30, determine the required couple that should be applied to the bolt and nut. The mean diameter of the thread is 0.94 in., and the lead is 0.125 in. Neglect friction between the nut and washer, and assume the bolt to be square-threaded. You must show a free body diagram of your block and incline analysis of the bolt and nut, and clearly indicate your force triangle, if any.

In the vise shown in the figure, the screw is single-threaded in the upper member: It passes through the lower member and is held by a frictionless washer. The pitch of the screw is 3 mm, its mean radius is 12 mm. and the coefficient of static friction is 0.15.   Determine the magnitude P of the forces exerted by the jaws when M= 74-N.m couple is applied to the screw. Assuming that the screw is single-threaded at both A and B (right-handed thread at A and left-handed thread at B)   The value of magnitude P is      KN?     Note: please consider everything. Refer to the image for more clarity. On occasions, I receive wrong answers!!. Kindly please show the magnitude of P which is the final answer in " KN" in the step by step working out please. Appreciate your time!. Side note, the answer in the image is wrong. This question is very annoying!. And a lot of experts have given me wrong answers!. So I beg to show concise working out!. Also I've attached another image something to help with…