The voltage, v(t) and current i(t) input to a circuit is given by v(t) = 240 cos(2πt) and i(t) = v(t) 2 .What is the Power consumed by the circuit?. P = R T 0 v(t)i(t)dt, where T is the time period of the waveform v(t). (Steps would suce if you cannot quickly get the nal value).

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?