En un almacen de maquinas se emplea una prensa hidraulica para levantar equipo pesado para repararlo. El sistema tiene un piston pequeño cuya seccion transversal tiene un area de 0,07M^2 y el piston grande una seccion transversal de 0,21M^2 de area. Un motor que pesa 2700N descansa sobre el pistón grande ¿Que fuerza se debe aplicar sobre el piston pequeño para que levante el motor

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

What is the momentum of a 2 kg object moving at 15 meters per second

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.