An electron is released from rest at the negative plate of a parallel plate capacitor. the charge per unit area on each plate is = 2.1 × 10^-7 c/m^2, and the plates are separated by a distance of 1.2 × 10^-2 m. how fast is the electron moving just before it reaches the positive plate?

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.