Superman takes 8 seconds to stop a runway train over a distance of 58 m using a power of 75000W. How much work was done to stop it?

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?

How does the entropy of steam compare to the entropy of ice?