2. Determine the velocity of the 160-1b block A if the two blocks are released and the 30-1b block B moves 5 ft up the incline. The coefficient of kinetic friction between both blocks and the inclined planes is 4 = .20.

The homogeneous disk of mass m is resting on the right-angled supporting surfaces shown. The tension P in the cord is very gradually increased from zero. If the friction at both A and B is characterized by us = 0.23, what happens first - does the homogeneous disk slip in place or does it begin to roll up the incline? Determine the value of P at which this first movement occurs. Assume 0 = 25° B 0.75r/ Answer: P = i P Ө mg

Problem 13.21 The 450-kg mine car is hoisted up the incline using the cable and motor M. For a short time, the force in the cable is F= (3000t2) N, where t is in seconds. (Figure 1) Figure 1 of 1 ₁ = 2 m/s wh T Part A If the car has an initial velocity ₁ = 2m/s at s = 0 and t = 0, determine the distance the plane when t = 3 s. Express your answer to three significant figures and include the appropriate units. S = O D Submit |μA Value Units My Answers Give Up ? Provide Feedback moves up Continue

The coefficient of static friction for both wedge surfaces is 0.34 and that between the 34-kg concrete block and the 25° incline is 0.66. Determine the minimum value of the force P required to begin moving the block up the incline. Neglect the weight of the wedge. P 3.7 Answer: P = 34 kg 25° N