The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by B equals 1.2 cross times 10 to the power of negative 6 end exponent sin open square brackets 2 straight pi open parentheses straight z over 240 minus fraction numerator straight t cross times 10 to the power of 7 over denominator 8 end fraction close parentheses close square brackets in SI units. Find the average power per square meter carried by the EM wave.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)