# ylopez

Most popular questions and responses by ylopez
1. ## Physics

A uniform 100-N pipe is used as lever. Where the fulcrum (the support point) must be placed if a 500-N weight at one end is to balance a 200-N weight at the other end? What is the reaction force exerted by the support on the pipe?

2. ## Physics

When a force of 500 N pushes on a 25-kg box, the acceleration of the box up the incline is 0.75 m/s^2. If the inclined plane makes an angle of 40 degrees relative to the horizontal level, what is the coefficient of kinetic friction?

3. ## Physics

Randy pushes a 30.0 kg box resting on a rough surface by exerting a force of 85.0 N. The box did not move. What is the coefficient of static friction between the box and the surface where it lies?

4. ## Physics

A 20 kg slab is to be pulled up a plane inclined 20 degrees with the horizontal at a constant speed by a force that is directed 15 degrees above the surface of the inclined plane. Determine the magnitude of the force necessary to perform the task. The

5. ## Physics

A box with a mass of 10 kg slides along a horizontal surface. A force of 50 N is needed to keep it moving. What is the coefficient of kinetic friction?