Chapter 13, Problem 6FP

The double inclined plane supports two blocks A and B, each having a weight of 7 lb as shown below. If the coefficient of kinetic friction between the blocks and the plane is 0.09, determine the acceleration of each block.

2. The flatbed railway car travels at the constant speed of 60 km/h around a curve of radius 55 m and bank angle 15°. Determine the smallest static coefficient of friction between the crate and the car that would prevent the crate of mass M from sliding. R = 55 m 15°

3. A crate has a mass of 100kg and is being towed by a chain which is always directed at 2 from the horizontal. Determine the crate's acceleration in t=2sec if the coefficient of static friction is 0.4 and the coefficient of kinetic friction is 0.3 and the towing force is P= ()N, where t is in seconds.

Determine the minimum accelerations of the blocks such that block A does not move relative to block B. The coefficient of static friction between A and B is 0.20, and the horizontalplane is smooth.

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1. The 40-kg crate is pulled by the constant force P. If the crate starts from rest and achieves a speed of 10 m/s in 9 s, determine the magnitude of P. The coefficient of kinetic friction between the crate and the ground is 0.15. 30°

5. | Block A has a mass of 60 kg and rests on block B, which has a mass of 30 kg. If the coefficients of static and kinetic friction are indicated in the figure, determine the largest horizontal force P which can be applied to block B so that block A does not slip on block B while block B slides. H= 0.30- Hx = 0,35 B.

The crate has a mass of 80 kg and is being towed by a chain which is always directed at 20° from the horizontal as shown. If the magnitude of P is increased until the crate begins to slide, determine the crate's initial acceleration if the coefficient of static friction is = 0.5 and the coefficient of kinetic friction is pk = 0.3. 13

Two blocks of equal masses ma=mb=m, connectedtogether with a massless cord of fixed length, slidedown an inclined plane. The coefficient of kineticfriction between block A and the inclined surface isµA=µ and the coefficient of kinetic friction betweenblock A and inclined surface is µB=2µ.a- Draw free body diagram for each block.b- Find the acceleration of blocks in terms of m, µand q.c- Find the tension in the cord in terms of abovementioned parameters.