in a race a 54 kg athlete runs from rest to a speed of 11 m/s on a flat surface. the athletes body has an efficiency of 85% during the run. how much input energy did the athlete provide

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell