In an industrial process, nitrogen is heated to 500 k at a constant volume of 1 m3 . the gas enters the container at 300 k and 100 atm. the mass of the gas is 92.4 kg. use the van der waals equation to determine the approximate pressure of the gas at its working temperature of 500 k.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?