A bullet of mass 10 g strikes a ballistic pendulum of mass 2.0 . The center of mass of the pendulum rises a vertical distance of 12 Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.

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.