MB MA Ө Figure 1 alvallak: amaldon't Two masses, mA = ma = 2.7 kg, are connected by a string as shown in Figure 1. The coefficient of friction between mass A and it's incline is = 0.30. The angle of the incline is, 0 = 34 degrees. The blocks move such that mass B moves down and mass A moves up the incline.

A 1,380-N crate is being pushed across a level floor at a constant speed by a force F of 320 N at an angle of 20.0° below the horizontal, as shown in the figure a below. a) What is the coefficient of kinetic friction between the crate and the floor? (Enter your answer to at least three decimal places.)(b) If the 320-N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in the figure b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).m/s2

Two boxes are stacked as shown in the diagram below. The bottom box has a mass of 3.5 kg and the top box has amass of 1.5 kg. They are pushed up a ramp inclined at 15° by an applied force of 25 N, applied to the lower boxand directed parallel to the ramp. The coefficient of kinetic friction between the ramp and the bottom box is 0.12.Determine the minimum coefficient of static friction required to keep the top box in place on the bottom box.

Rachel pulls a 30.0 kg box across the floor with a rope that makes an angle of 32o with the floor. She pulls with a force of 250 N. The coefficient of friction between the box and the floor is 0.75. What is the acceleration of the box?