A rope is used to pull a 3.88 kg block at constant speed 4.28 m along a horizontal floor. The force on the block from the rope is 6.54 N and directed 13.5 above the horizontal. What are (a) the work done by the rope's force, (b) the increase in thermal energy of the block-floor system, and (c) the coefficient of kinetic friction between the block and floor?