PLEASE HELP ME A student takes a 200 N box from a shelf 1.5 m from the floor, and carries it 35 meters and places it on another shelf 1.5 m from the floor. How much work against gravity has she done?

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.