6. A motor winds the rope in B with a constant acceleration aB. Because of the pulley system, the mass m in A slides in this way to the left over a horizontal axis. Between m and the left end point of the horizontal axis, there is a spring (constant k, unstretched length l6). The coefficient of kinetic friction between m and the axis is µk. When Sa equals 1.5 m, vB equals 6 m/s. For this situation: a) determine at that instant the velocity Va and the acceleration aa of A, b) determine all the forces that apply on A, c) determine the force with which the motor pulls the rope. Data: ав 3 2 m/s2, m = 2 kg, k 150 N/m, l 2 m, µk = 0.3 %3D SA 2 m

i asked this before but somone answered wrong and disnt explain. please answer again and explain thanks i will like.

4: Find the smallest force P that the worker must apply to the barCD in order to initiate uphill motion of the homogeneous 80-kg spool. Thecoefficients of static friction are 0.12 at A and 0.36 at B. Neglect the weight ofbar CD.

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1. Parcels are moved via conveyor with velocity vo down to a colinear incline that is static at point A where sliding begins. The parcels eventually fall off at point B, which is 7.0 m past A. If the coefficient of kinetic friction on the incline is 0.40, find the velocity of the conveyor belt, vo, such that the parcels have zero velocity at point B. 7m 15°

Mary and her sister are playing with a cardboard box on the neighborhood hill. Mary climbs into the box, the total mass of the box with Mary in it is 115 kg. The box starts at rest at the beginning of the incline. The hill is at an incline of 28 degrees with respect to the horizontal.The static and kinectic friction between the box and hill is 0.4 and 0.2 respectively. Assume the box is sliding downhill. a. What is the magnitude of the acceleration of the box? (same as Problem 3b)b. If the hill is 5m tall, what is the Mary's speed when she reaches the bottom?c. At the bottom of the hill, the ground becomes level, but the coefficients offriction do not change. How far will Mary slide before she comes to a stop?

3. A 2-kg ball S is moved in the vertical plane by a robotic arm. When 0= 30°, the angular velocity of the arm about a horizontal axis through O is 50 deg/s clockwise, and the angular acceleration is 200 deg/s² counterclockwise. In addition, the hydraulic element is being shortened at the constant rate of 500 mm/s. Find the minimum gripping force needed to hold the ball is the coefficient of friction between the sphere and gripping surfaces is 0.5. Compare this force to the force needed to hold the sphere in static equilibrium.

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.

The uniform rod AB is in equilibrium at the position shown, resting on a horizontal floor and tied to the ceiling with a vertical cord BC. The coefficient of friction between the rod and floor is 0.600. Calculate the translational acceleration (magnitude and direction) of the center of mass of the rod and the angular acceleration (magnitude and direction) of the rod at the instant the cord is cut