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 =

Block A has a mass of 3.00 kg and block B has a mass of 8.00kg. The two blocks are stacked on the ramp with an incline of angle = 30 degrees. Determine the largest horizontal force F that can be applied to block B

Now the block on the table has friction.  Calculate the frictional force if the block is stationary. m = 8 kg M = 2.8 kg μs = 0.5 μk = 0.4

Many birds can attain very high speeds when diving. Using radar, scientists measured the altitude of a barn swallow in a vertical dive; it dropped 208 m in 3.0 s. The mass of the swallow was estimated to be 0.018 kg, and its cross-section area as 5.6 x 10-4 m2. What was the drag coefficient for this swallow as it dove?

a rock climber on a rock slab. The coefficient of kinetic friction between the climber's rock climbing shoes and the rock is 0.70.  If the climber slide down the rock starting from rest, the amount of time it will take the climber to slide to the edge of the rock slab is?  distance=16.4 m and theta is 68 degrees.

A 40 N box is resting on a table when a 20 N force is applied to it horizontally. The coefficients of static and kinetic friction are 0.3 and 0.1, respectively. Which of the following best describes the resulting motion of the box?    The motion of the box cannot be determined with the given information.      The box accelerates in the direction of the applied force.      The box remains at rest.      The box moves with a constant velocity in the direction of the applied force.

The 118-lb force P is applied to the 250-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume ??= 0.48, ??= 0.38.

A 489-kg crate is placed on an adjustable inclined plane. As one end of the incline is raised, the crate begins to move downward. If the crate slides down the plane with an acceleration of 0.08 m/s2 when the incline angle is 31°, what is the coefficient of kinetic friction between ramp and crate? (g = 9.8 m/s2)

You push downward on a trunk at an angle 25° below the horizontal with a force of  750N If the trunk is on a flat surface and the coefficient of static friction between the surface and the trunk is 0.61, what is the most massive trunk you will be able to move?     93 kg     81 kg     112 kg     73 kg

A baseball player initially running 8.94 m/s slides 5.26 m to a stop at home plate. What is the coefficient of kinetic friction between his uniform and the ground? Equations: vf2 = vi2 + 2×a×Dx                           F = ma                   fk = mkN                 N = Fg = mg