The switch in the circuit has been closed for a long time and is opened at t = 0.

a. Calculate the initial value of i.
b. Calculate the initial energy stored in the inductor.
c. What is the time constant of the circuit for t > 0?
d. What is the numerical expression for i(t) for t ≥ 0?
e. What percentage of the initial energy stored has been dissipated in the 4 Ω resistor 5ms after the switch has been opened?

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.