A fish in a flat-sided aquarium sees a can of fish food on the counter. To the fish's eye, the can looks to be 23 cm outside the aquarium. What is the actual distance between the can and the aquarium?

What is the most useful equation for electric power?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.