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An overweight acrobat, "weighing" in at 115 kg, wants to perform a single hand stand. He tries to cheat by resting one foot against a smooth frictionless vertical wall. The horizontal force there is 130 N. What is the magnitude of the force exerted by the floor on his hand? Answer in N A father is pulling his daughter uphill on a sled in slushy snow. The daughter has a mass of 22.7 kg; the sled has a mass of 3.18 kg. The coefficient of kinetic friction between the hill and the sled is 0.212 and the coefficient of static friction between the hill and the sled is 0.317. How hard does the father have to pull the sled in order to keep it moving at a constant velocity? The child holds on tightly and so does not fall off the sled, and the hill makes an angle of 15.50 with the horizontal. A 540 kg car is merging onto the interstate on a banked curve. The curve is banked 7.10 from the horizontal and is rated at 35 mph. The car takes the turn at 52 mph (23 m/s). What sideways frictional force is required between the car and the road in order for the car to stay in its lane? The radius of the curve is 210 m A 15 kg block rests on an inclined plane. The plane makes an angle of 250 with the horizontal, and the coefficient of friction between the block and the plane is 0.13. The 15 kg block is tied to a second block (mass=38 kg) which hangs over the end of the inclined plane after the rope passes over an ideal pulley. What is the acceleration of each of the two blocks, and what is the tension in the rope