What should be the weight of the body 1 in order to start sliding upwards along the inclined plane, if the force F = 90 N, and the coefficient of friction f = 0.3?

Immediately after payment you will receive a link to the zip file with the solution of the problem 2.5.7 (Chapter 1 - statics topic - 2.5: Balance of the body based on sliding friction.) In theoretical mechanics from the collection of short tasks Kep OE, JA Viba, OP Grapis, JA Svetinysh and others. Publishing Moscow / Graduate School / 1989, 2009, 2012. The task is made in the format word (typed or hand-written decision in a Word) or in manuscript form in the format gif, packed to the archive zip (open on any PC) .After checking the solutions would be very grateful if you leave your positive feedback.