The jacking mechanism consists of a link that has a square-threaded screw with a mean diam...

The jacking mechanism consists of a link that has a square-threaded screw with a mean diameter of 0.5 in. and a lead of 0.20 in., and the coefficient of static friction is µs = 0.4. Determine the torque M that should be applied to the screw to start lifting the 6000-lb load acting at the end of member ABC.