A boy whirls a stone in a horizontal circle of radius 1.8 m and at height 2.2 m above level ground. The string breaks, and the stone flies off horizontally and strikes the ground after traveling a horizontal distance of 9.3 m. What is the magnitude of the centripetal acceleration of the stone while in circular motion? Number Enter your answer in accordance to the question statement Units Choose the answer from the menu in accordance to the question statement

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.