Question

17. An 18.0-kg box is released on a 37 degree incline and accelerates down the incline at 0.270 m/s². Find the friction force impeding its motion. How large is the coefficient of kinetic friction? 18. A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 28 degrees above the horizontal. The coefficient of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 13 N. What is the mass of the box? 19. A carton is given an initial speed 3.0 m/s up a 22 degree inclined plane, with ?k = 0.12 between the carton and the plane. How far up the plane will it go? How much time elapses before it returns to its starting point? Ignore friction.

          17. An 18.0-kg box is released on a 37 degree incline and accelerates down the incline at 0.270 m/s². Find the friction force impeding its motion. How large is the coefficient of kinetic friction?
18. A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 28 degrees above the horizontal. The coefficient of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 13 N. What is the mass of the box?
19. A carton is given an initial speed 3.0 m/s up a 22 degree inclined plane, with ?k = 0.12 between the carton and the plane. How far up the plane will it go? How much time elapses before it returns to its starting point? Ignore friction.

17. An 18.0-kg box is released on a 37 degree incline and accelerates down the incline at 0.270 m/s². Find the friction force impeding its motion. How large is the coefficient of kinetic friction?
18. A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 28 degrees above the horizontal. The coefficient of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 13 N. What is the mass of the box?
19. A carton is given an initial speed 3.0 m/s up a 22 degree inclined plane, with ?k = 0.12 between the carton and the plane. How far up the plane will it go? How much time elapses before it returns to its starting point? Ignore friction.

Added by Harold R.

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