(b) Using Diagrams 7.1 and 7.2, compare the mass of naphthalene, the time taken for the naphthalene to solidify and the latent heat released. Relate the mass of naphthalene and the heat released to deduce a relevant physics concept.
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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.