An athlete is pulling a tire that weighs 12,000 N. The coefficient of static friction between the tire and the ground is 0.42. If the angle that the rope makes with the horizontal is 24 degrees, what is the magnitude of the force that the woman must exert on the rope to just get the tire to start moving?
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- A child has mass 24.0 kg and slides down a 23° incline with constant speed under the action of a 91.9 N frictional force acting up and parallel to the incline. What is the coefficient of kinetic friction between the child and the surface of the incline? ?k =Your friend asks for help moving a box across the apartment floor and tells you that the box weighs 422 N. Your friend also informs you the box, currently motionless, has a coefficient of static friction (us=0.42) and a coefficient of kinetic friction (u=0.31) between it and the floor. You apply a horizontal force of 208 N on the box. Calculate the magnitude of the frictional force, f, acting on the box while you apply that force. Take the acceleration of gravity to be 9.81 m/s². f = O Search N 7:59 PM 11/29/2022A 20 kg box is resting on horizontal surface initially. Then a F = 50 N force pulls on the box by a cord at an angle of 20 degrees above horizontal. The kinetic frictional coefficient is 0.20.
- A block with a mass of 4.58 kg is on a horizontal surface. The coefficients of static and kinetic friction between the block and surface are 0.593 and 0.238, respectively. A string is pulling horizontally on the block. The block is moving in the direction of the tension at a constant speed of 3.98 m/s. What is the magnitude of the net force that is acting on the block?Sammy is doing a strength testing session on the turf in preparation for the upcoming basketball season. Sammy's mass is 55 kg and she is trying to push a 105 kg sled across the artificial turf outside on Raymond Field. The coefficient of static friction between the sled and the turf is 0.3. If Sammy pushes only horizontally against the sled, how much force must she push with to just initiate movement of the sled?A flatbed truck is carrying a 30-kg crate up a sloping road at a constant speed. The coefficient of static friction between the crate and the bed is 0.60, and the coefficient of kinetic friction is 0.25. What is the maximum angle of the slope that the truck can climb if the crate is to stay in place? Answer in degrees.
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