A Cepheid variable star has an apparent brightness of 85 and a period of 14.3 days. This means the star is 85 times brighter than the Sun would appear at a distance of 1 Megaparsec. About how far away is this star?

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) =_