Acrane used 900 n of force to lift a load 100 m. how much work did the crane do?

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

What can you increase the strength of an electromagnet by

Contains chemical energy. a. heat b. light c. natural gas