For the RL circuit, find the inductor current before t=0, after t=0 & long after t=0, equivalent R, time constant and an expression for the inductor current For the RL circuit, the switch has been closed for a long time before it opens at time t=0
a) Find the inductor current right before t=0
- b) inductor-current right after t=0
- c) inductor-current a long time after the switch is open
d) Find the equivalent resistance that the inductor sees after the switch opens?
e) Find the time constant for t>0
f) Find an expression for the indicator current i(t) for t>0

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed