Determina el modulo de la fuerza de rozamiento de un cuerpo de 30 kg de masa que se encuentra sobre una superficie horizontal con un coeficiente de rozamiento de 0,30; si se encuentra en moviemiento. Es urgent por favor

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) =_