Johanna is a crime scene investigator and tapes off two squares at a crime scene. The first square is 3 feet larger than the second, and the total area of the two squares is modeled by the equation (y + 3)² + y² = 369 where y is the length in feet of the side of the smaller square.

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

Ineed the answer to question 1 , i’m desperate

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery