The coefficient of static friction for both wedge surfaces is 0.32 and that between the 36-kg concrete block and the 26° incline is 0.: Determine the minimum value of the force P required to begin moving the block up the incline. Neglect the weight of the wedge. 36 kg 6.7 26° Answer. D.

1. Block on Incline Determine whether the block shown is in equilibrium, and find the magnitude and direction of the friction force when = 30° and P = 200 N. impossible Block moves F = 193.2 N/ H, = 0.30 H = 0.20 P I KN

EXERCISE 2.34 The cable, whose length is 300 mm, is fastened to the 500-g block. Clockwise rotation of the arm at a constant angular speed of 5 rad/s causes the block to slide outward. The motion occurs in the vertical plane, and the coefficient of sliding friction is 0.4. Determine the tensile force in the cable and the force exerted by the block on the walls of the groove when = 53.1301⁰. 300 mm -300 mm- (Hint: use polar coordinates to solve the problem. R is from the rotation center of the arm to the block and is as shown in the Figure. Let L be the total length of the cable and S be the length from the clamped end of the cable to the end of the arm.)

While digging a small hole prior to planting a tree, a homeowner encounters rocks. If he exerts a horizontal 199-N force on the prybar as shown, what is the horizontal force exerted on rock C? Note that a small ledge on rock C supports a vertical force reaction there. Neglect friction at B. Complete solutions (a) including and (b) excluding the weight of the 23-kg prybar. 199 N 1260 mm 21 190 mm Answers: (a) Including weight, Fc = i N (a) Excluding weight, Fc = i N