While on a luge run in the Olympics, the sled (mass = 157 kg) rounds a horizontal curve of radius 5.8 m with a speed of 18.5 m/s. Assuming there is no friction, what is the normal force exerted by the track on the sled?

In a system, when potential energy decreases, then entropy also decreases. true false

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)