Question: Need some help answering this question, much appreciated! A box of mass M is held at rest against a wall with a force F directed

Need some help answering this question, much appreciated!

A box of mass M is held at rest against a wall with a force F directed at an angle 0 below the horizontal as shown below. The box and the wall have coefficient of static friction . M 20 g F 2a. [10 pt.] Find the maximum force F that can applied without moving the box. Please draw a free body diagram for the problem with all the relevant forces on them. To receive partial credit please show all intermediate steps. 2b. [4 pt.] What is the maximum value of the coefficient of static friction / such that the box will always slip however much force F is applied

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