Chapter 8, Problem 115P

The figure shows a bar in equilibrium position resting on the floor at point A and on the wall at point B. If the mass of the bar is m and the angle it makes with the floor is θ = π/6, find the magnitudes of the frictional and normal forces at points A and B.

The 381-N force is applied to the 83-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force Fexerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. P = 381 N 21° H, = = 0.58 H= 0.42 %3D Answer: F =

3 - please show the complete solution, thanks!

A chain having a length L and weight W rests on a street for which the coefficient of static friction is us. If a crane is used to hoist the chain, determine the force P it applies to the chain if the length of chain remaining on the ground begins to slip when the horizontal component is Px. What length of chain remains on the ground? Given: L = 20 ft W = 8lb/ft = 0.2 us= : 10 lb Px =

1. If the spring is compressed a distance 6 and the coefficient of static friction between the tapered stub S and the slider A is sA, determine the horizontal force P needed to move the slider forward.The stub is free to move without friction within the fixed collar C. The coefficient of static friction between A and surface B is µAB. Neglect the weights of the slider and stub. Given: 8 = 60 mm HsA = 0.5 HAB = = 0.4 N k = 300 e = 30 deg B

The uniform box shown in next figure, has a mass of 40 Kg. If the two forces T 60 N and F 30 N are applied on the box, determine if it remains in equilibrium. The coefficient of static friction (u) = 0.24 F=30N T=60N 30 40 Kg

Find the degree(s) of freedom and the type of constraint. Show using the principal of virtual work: m2 = γm1/2 where γ is the coefficient of friction.

4. The mine car and its contents have a total mass of 6000 kg and a centre of gravity at G. If the coefficient of static friction 10 kN between the wheels and the 0.9 m •G tracks is u = 0.4 when the wheels are locked, find the normal force acting on the front wheels at B and the rear 0.15 m 0.6 m - 1.5 m wheels at A when the brakes at both A and B are locked. Does the car move? [Ans. NA = 16.5 kN, Ng =42.3 kN, the car does not move] %3D lyp

Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when 0 = 30° and P= 45 lb. Given: μs = 0.30 and k = 0.20. 250 lb The block is not in equilibrium and moves down. True The magnitude and direction of friction force is 86.03 lb 7