A block of mass m = 331 g is dragged with a string across a rough horizontal table. The string tension is T = 2.47 N, and it pulls upward at an angle of ø = 42.0° with the horizontal. At one particular instant, the block is moving at a speed of v = 6.10 m/s. The coefficient of kinetic friction between the block and the table is uk = 0.609. m What is the power Pr supplied to the block by the string tension? PT = W What is the power Pf supplied by the force of friction? Pf = W At this instant, the block's speed is increasing. decreasing. O impossible to determine. constant.

The overworked Amazon delivery person is driving up a steep hill with an incline of 26° when a box they forgot to secure starts sliding toward the back of the truck. The 3.5 kg box starts from rest near the drivers seat and slides 2.1 m along the floor to the rear door. The coefficient of kinetic friction between the box and the floor is 0.36. What is the work done by the weight of the box? Wmg 31.6 J What is the work done by the Normal Force? WN = 0 What is the work done by the frictional force? Wfk = 23.31 What is the net work done on the box? Wnet What is the change in kinetic energy for the box? AKE How fast is the box moving just before it hits the rear door? Vfinal = J J X J J ms

Starting from rest, a 6.6-kg block slides 3.3 m down a rough 36-degree incline. The coefficient of kinetic friction between the block and the incline is μk = 0.49.  Determine the net work done on the block.

When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the engine is 195 hp, estimate the total friction force acting on the car when it is moving at a speed of 30 m/s. One horsepower equals 746 W.