2. A 250-lb block Is initially at rest on a flat surface that is inclined at 30°. If the coefficient of kinetic friction is 0.30 and the coefficient of static friction is 0.40, find the force required to start the block moving up the plane. 25016. 30°
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- Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair is denoted by G. The coefficient of static friction is 0.2 at B (the contact point between the chairs) and 0.35 at A, C, and D. Determine the smallest force P that would cause sliding.The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.
- 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.The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of static friction between each pad and the cylinder is 0.15. Find the smallest tension in the spring that would prevent the cylinder from rotating when the clockwise couple M=2200lbin. is applied. Neglect the weights of the members.
- 2. A 250-lb block Is initially at rest on a flat surface that is inclined at 30°. If the coefficient of kinetic friction is 0.30 and the coefficient of static friction is 0.40, find the force required to start the block moving up the plane. 250 1b. 30°• Draw a free body diagram of the box on the incline. . Determine the weight (W) of the box on the incline surface. Determine the normal force (N) acting on the inclined box. Determine the friction force (F) acting on the inclined box. ● 7. A box of unknown weight is being pulled on a = 39 degree inclined surface by a frictionless pully system attached to a 540 pound box hanging off the pully. The coefficient of static friction between the box and the inclined surface is μ = 0.33 and both boxes are not moving. Answer the questions below: ● W= N = Ff= 0 W lbs lbs lbs 540 lbs2. A box of 450N is lying in an inclined plane with angle of 35 degrees. If the applied load to move the box is 269N. Determine the net Ff and the acceleration of the box if the coefficient of static friction is 0.35 and the coefficient of kinetic friction is 0.28.
- A stepladder consisting of two legs pinned together at C is resting on a rough floor. The uniform legs AC and BC weigh 17 kg and 12 kg, respectively. The coefficient of static friction at A and B is 0.48. What is the maximum weight of the worker (in kg) to avoid slipping while changing the light-bulb? (Hint: Only one leg will slide at a time) *Write your answer in two decimal places. 1.6 m 60° 60° A| 5.2 m4. The 500KN block is in contact with a 45degree incline. The coefficient of static friction is 0.25. Which of the following most nearly gives the horizontal force P necessary to just prevent the motion down the incline? 1. 970KN 2. 300kN 3. 830kN 4. 640KN1. Draw a free body diagram for the block on the ramp that is attached to the string. There is no friction between the block and the ramp. The angle of the ramp is 35 degrees with respect to the horizontal, and the angle of the string is 45 degrees with respect to the horizontal. The block is at rest, and it has a mass of 10 kg. The acceleration due to gravity for this experiment is 9.8 m/s?. 450 35° 2. Decompose all of the forces into x and y forces 3. Sum the x forces and set them equal to what they should be set equal to. Sum the y forces and set THEM equal to what they should be set equal to.