Suppose you are given an Op Amp and 20 resistors, each with resistance R. Assuming ideal Op-Amp behavior, design a circuit which, given input voltages v1, v2, v3, and v4, will deliver a voltage vo, given by vo = 2v1 + 4v2 -2v3-4v4 to a load resistor RL.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.