3. The input function f(t) in question 1 now has an "on" and "off" switch. The input function is turned "on" at t=2s. Hint: You would be using the Step function/Heaviside function. a. Write the resultant differential equation of the system. b. Determine the response to the force input.

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.

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false