II. PROBLEMS 1. Compute the acceleration of body B, and the tension in each cable supporting each block. WA= 200 N, WB= 300 N. Coeff friction is 0.2. 3 B 4 |A
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- The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.2. Compute the horizontal force P required to prevent the block from sliding down the plane for the 100 lb block shown. Assume the coefficient of static friction to be 0.65. 30° W = 100 lb MRSM1. Two blocks respectively A weighs 1800N and B weighs 2500N are connected by a spring both rests on an inclined plane downward to the right at a slope of 3 vertical to 4 horizontal. Their motion is down to the incline and resisted by a force P = 1000N. Their coefficient of friction is 0.30 under A and 0.10 under B. Compute the force in the spring.
- 1.The figure shows 3 blocks. Block C hangs from a rope which passes through a fixed cylinder and is attached to block B. Find the maximum mass of block C so that block B does not move to the right. Take into account that there are frictional forces at all points of contact. Consider the given values of the masses and , the coefficient of static friction between surfaces µ1 and the coefficient of friction static between the cylinder and the uC chord. Here are the values: ma= 72 kg mb= 62 kg u1= 0,47 uC=0,37A 200 lb block is in contact with a plane inclined at 30 degrees to the horizontal. A force P, parallel to and acting up the plane, is applied to the body. If the coefficient of static friction is 0.20, find: a. the value of P to just cause the motion to impend up the plane b. the value of P just to prevent motion down the plane c. the magnitude and direction of the friction force F if P= 80 lbsTwo blocks respectively A weighs 1600N and B weighs 2400N are connected by a spring both rests on an inclined plane upward to the right at a slope of 3 vertical to 4 horizontal. Their motion is down to the incline and resisted by a force P-800N. Their coefficient of friction is 0.30 under A and 0.10 under B. Compute the force in the spring.
- Situation 2: Find the minimum force P required to just pull out box B. Also, find the tension of the cord supporting box A. Take note that the coefficient of friction between the blocks is 0.10. While between block B and the ground, u = 0.25. 350 N B 70N A. Magnitude of P (N) B. Tension on the cable (N)Q1/What weight W is necessary to start the system of blocks shown in the figure moving to the right? The coefficient of friction is 0.10 and the pulleys are assumed to be frictionless. JOAN W2. Find the least value of P required to cause the system of blocks to have impending motion to the left. The coefficient of friction is 0.2 under each block. 300 Ib 100 lb 30 °
- Q1/ As shown in Fig.( 1 ). A horizontal force of P=350N is required to just push the crate up the plane. If you know the coefficient of static friction between the plane and the crate (0.3). Find the mass of the crate.A car with a four-wheel drive weighs 3000 lb and has a wheelbase of 10 ft. The e.g. is 3 ft above the pavement and 4 ft ahead of the rear wheels. Compute the active force acting at the rear wheels when the car accelerates at 1/3 g ft per sec^2? Asume the coefficient of friction is equal at all four wheels.In the figure, a flexible belt runs from A over the compound pulley B & back over P to a 200-N weight. The coefficient of friction is 1/π between the belt & the compound pulley P. Find the maximum weight W that can be supported w/out rotating the pulley P or slipping the belt on the pulley P.