A 20 kg sled is pulled up a 10m tall hill. What work is done against gravity?

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o