The sinusoidal voltage v= 200 sin(2m1000 t -60°) is plotted in the figure. Determine the time f 200

How to convert 10 kW of power into the unit dBW? I am very confused. Need immediate help, please.

A scientist working under emergency conditions at a jungle based lab realizes that her primitive radio has shorted in the rain and burned out a resister. She wants to match the original resister of 2.50 Ohms but believes that a resistance between 2.25 - 2.75 Ohms would be sufficient. All she has to work with is a spool of fine lead soldering wire and some scrap equipment. a) The wire has a diameter of 1.5 mm and the resistivity of lead is 22*10-8Ohm-meters. How much lead wire would she need to make the resister? b). Looking around the lab she is able to scavenge two 3.5 ohm and one 1.0 ohm resisters from old equipment. Using these three resisters how close can she come to building a 2.50 ohm resister? Explain the optimal configuration and calculate the equivalent resistance.