The critical constants of methane are pc = 45.6 atm, vc = 98.7 cm3 mol−1, and tc = 190.6 k. calculate the van der waals parameters of the gas and estimate the radius of the molecules.

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_