Jim pushes hard on a rock that weighs 500 pounds. he pushes with a force of 50 pounds, but the rock doesn't move. how much work did jim do?

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.

Difference between natural and artifical magnet