What is the velocity of a 50kg skater if her momentum is 225kg. m/s?

In what direction does the medium move relative to the direction of the wave? explain.

In which of the following is positive work done by a person on a suitcase

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.