A resistor with R = 350 Ω and an inductor are connected in series across an ac source that has voltage amplitude 490 V . The rate at which electrical energy is dissipated in the resistor is 286 W . (a) What is the impedance Z of the circuit?
(b) What is the amplitude of the voltage across the inductor?
(c) What is the power factor?

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is