Fig. 1 shows an op amp with a negative feedback path.
assume that μ = 800v/v, rs = 20kω, rid = 1000kω,
ro = 10kω, rl = 2kω, r1 = 2kω and r2 = 1kω.
(a) show the expression and calculate the value of
loop gain by breaking the loop at xx’. you must draw
the circuits after breaking the loop. (10%)
(b) if μ increases by 15%, what’s the corresponding increase
in the closed-loop gain? (6%)

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.