A 50-N object sits on a 20° rough incline.   It is attached to a 10-N object over a pulley.    The coefficients of static and kinetic friction are 0.70 and 0.20, respectively.   We want to know whether or not the object will slide.   With that in mind, fill out the following table, leaving any quantity that is not given as a variable:

You press a book perpendicularly against a vertical wall with a force of 27 N. The coefficient of static friction is 0.70 between your hand and the book and 0.50 between the book and the wall. What is the maximum book mass you can hold this way and keep from slipping?

Three objects are connected as shown in the figure.  The strings and frictionless pulleys have negligible masses.  The coefficient of kinetic friction is 0.25 and static friction is 0.30.  Block A has a mass of 3 kg and block B has a mass of 4 kg.  a) What is the maximum mass block C can have before block B will start to move?  b) If block C has a mass of 7 kg. and was 1 m above the ground, how long would it take block C to hit the ground starting from rest?

Three cables are used to tie the balloon shown in Figure. Determine the magnitude of the vertical force (P) exerted by the balloon at A, knowing that the tension in cable AD is 1.099 N. y1 = 4.3 m y2 = 2.2 m x1 = 4.4 m x2 = 3.1 m z = 5.8 m