Ablock-spring system oscillates with an amplitude of 3.55 cm. the spring constant is 250 n/m and the mass of the block is 0.800 kg. (a) determine the mechanical energy of thesystem. (b) determine the maximum speed of the block. (c) determine the maximum acceleration.

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.