Chapter 8, Problem 48P

PLLLSS ANSWER WITHIN AN HOUR    The spool in the given figure weighs 25 N, and its center of gravity is located at the geometric center. The weight of block C is 50 N. The coefficients of static friction at the two points of contact are as shown. Determine the largest horizontal force P that can be applied without disturbing the equilibrium of the system.

Find the value s so that the worker can climb the ladder without causing it to slip. The weight of the worker is 90-kg and neglect the weight of the ladder. The ladder has a small roller at the top and at the ground the coefficient of static friction is 0.25. The center of mass of the worker is directly above her feet. B 4 m 1.5 m

The figure shows a part of a machine used to crush recycled cans. Link ABC is attached to the ground at pin A and link BD is attached to the piston D using also a pin connection. When α=45°, θ=55°, and β=15°, the machine is about to start moving, i.e. impending motion. If the coefficient of static friction and kinetic friction between the piston D and the wall are μs=0.25 and μk=0.2 respectively, find the magnitude of force applied to the cans by the piston for P=200 kN.

Consider (Figure 1). The cord is attached to the 36-lb block, and the coefficients of static friction are HB = 0.2 and μp = 0.3. Figure M 1.5 ft B 3 ft -1.5 ft- D C < 1 of 1 Part A Determine the smallest couple moment which can be applied to the 24-lb wheel that will cause impending motion. Express your answer in pound-feet to three significant figures. VAΣo↓↑ vec M = Submit Provide Feedback Request Answer A ? lb-ft

The uniform concrete block has a weight of 300 lb. The coefficients of static friction are μA = 0.2, μB = 0.3, and between the concrete block and the floor, μ = 0.4. (Figure 1) Determine the smallest couple moment that can be applied to the 190-lb wheel that will cause impending motion.

The coefficient of static friction between the 65-lb roller and the ground is μ = 0.2. Fins the greatest force P that can be applied to the handle to that the roller rolls on the ground without slipping. The roller can be assumed to be a uniform cylinder. Note: when a wheel rolls without slipping, the point of contact between the wheel and the ground is stationary, so the static coefficient of friction is used. 40° 3 ft

M. 0.3 m The block brake is used to stop the wheel from rotating when the wheel is subjected to a couple moment. Determine the smallest force P that should be applied as well as the magnitude of the corresponding reaction force at support C. Use the couple moment Mo = 430 N-m, the coefficient of static friction between the wheel and the block of 0.6, a = 1.8 m, b = 0.8 m, and c = 0.075m. Round all answers to the nearest integer. The smallest force P that should be applied is: N. The magnitude of the reaction force at support C is: N.

The three identical rollers are stacked on a horizontal surface as shown. If the coefficient of static friction µ is the same for all pairs of contacting surfaces, find the minimum value of μs for which the rollers will not slip. - Answer: Us=

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