1. A 5.60kg block located on a horizontal floor is pulled by a cord that exerts a force F = 11.5 N at an angle theta = 28.5o above the horizontal, as shown in the Figure. The coefficient of kinetic friction between the block and the floor is 0.08. What is the speed of the block 5.5s after it starts moving?
2. A block is at rest on an inclined plane whose elevation can be varied. The angle of elevation theta is increased slowly from the horizontal, and when it reaches 35.9 degrees, the block begins to slide. Calculate the coefficient of static friction.
3. The block reaches a speed of 3.18m/s in a time of 1.23s. Calculate the coefficient of kinetic friction.