A sled drops 50 meters in height on a hill. The mass of the rider and sled is 70 kg and the sled is going 10 m/s at the bottom of the hill. What is the efficiency of energy conversion from potential to kinetic?

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

Frequency of electromagnetic waves that a radio station is assigned. what do you call this type of wave?