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Boxes A and B are at rest on a conveyor belt that is initially at rest. The belt is suddenly started in an upward direction so that slipping occurs between the belt and the boxes. Knowing that the coefficients of kinetic friction between the belt and the boxes are
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Chapter 12 Solutions
Vector Mechanics for Engineers: Dynamics
- A block A of 60.0 lb is connected to a block B of 10.0 lb by means of a rope and an ideal pulley. The system is released from rest. Between block A and the surface, there is a coefficient of kinetic friction of 0.10. Block A has descended 5.00 ft. At this moment, determine: a. The displacement of block B.b. The magnitude of the tension in the rope.c. The speed of block B.d. The speed of block A.arrow_forwardTo unload a bound stack of plywood from a truck, the driver first tilts the bed of the truck and then accelerates from rest. Knowing that the coefficients of friction between the bottom sheet of plywood and the bed are μs= 0.40 and μk= 0.30, determine (a) the smallest acceleration of the truck which will cause the stack of plywood to slide, (b) the acceleration of the truck which causes corner A of the stack to reach the end of the bed in 0.9 s.arrow_forwardI need answer within 20 minutes please please with my best wishesarrow_forward
- Problem 2 Block A has a mass of 50 kg, and block B has a mass of 15 kg. They are stacked, connected by a cable running through frictionless pulleys, and positioned on a slope of 0 = 20'. The coefficient of kinetic friction between all surfaces of contact is µx = 0.35. The applied force is P = 65 N. Assume the force is sufficient for the blocks to start moving. B. Determine (a) the acceleration of block B, (b) the tension in the cord.arrow_forward2- The two blocks shown are originally at rest. Neglecting the masses of the pulleys and the effect of friction in the pulleys and assuming that the coefficients of friction between block A and the horizontal surface are µz = 0.25 and u = 0.20, determine (a) the acceleration of each block, (b) the tension in the cable.arrow_forwardCrate A is gently placed with zero initial velocity onto a moving conveyor belt. The coefficient of kinetic friction between the crate and the belt is μk . Draw the FBD and KD for A immediately after it contacts the belt.arrow_forward
- A 10-lb bock is resting on an inclined surface at an angle of 30°, as shown. The block is in contact with a compressed spring that has a modulus of 75lb/in. The spring has an initial compression of 6 inches that is released by cutting the restraining cords. If the coefficient of kinetic friction between the inclined surface and the block is 0.15, determine the speed of the block as it leaves the spring. Position B L. Position A Position C 6 in, Restraining cords ww. H = 0.15 k = 75 lb/in 30°arrow_forwardKnowing that the coefficient of static friction between the tires and the road is 0.80 for the car as shown in figure 2. At this car, suddenly brakes are applied when it was moving with velocity of 360 inch/sec and it skidded to rest in 240 inch. Determine the magnitude of the normal reaction and of the friction force in the terms of W(weight) at each wheel as the car skidded to rest. { Use m=w/g, for the mass of the car if required, where g=386.09inch/s2.}arrow_forwardDerive an expression for the work Wf done on the block by friction as it travels from the top of the incline to the bottom. (Express your answer in terms of the variables μ, m, g, h, and α) When α is decreased, does the magnitude of Wf increase or decrease?arrow_forward
- Block A has a mass of 50 kg, and block B has a mass of 15 kg. They are stacked, connected by a cable running through frictionless pulleys, and positioned on a slope of 0 30°. The coefficient of kinetic friction between all surfaces of contact is k 0.25. The applied force is P = 75 N. Assume the force is sufficient for the blocks to start moving. Determine (a) the acceleration of block B, (b) the tension in the cord. 0 A B Parrow_forward3- To unload a bound stack of plywood from a truck, the driver first tilts the bed of the truck and then accelerates from rest. Knowing that the coefficients of friction between the bottom sheet of plywood and the bed are us = 0.40 and u = 0.30, determine (a) the smallest acceleration of the truck which will cause the stack of plywood to slide, (b) the acceleration of the truck which causes corner A of the stack to reach the end of the bed in 0.9 s. 40 20 00arrow_forward3. A small block B fits inside a lot cut in arm OA which rotates in a vertical plane at a constant rate. The block remains in contact with the end of the slot closest to A and its speed is 1.4 m/s for 0< 0 <150°. Knowing that the block begins to slide when 0 = 150°, determine the coefficient of static friction between the block and the slot. V = 0.3 m Aarrow_forward
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