1. Two vertical forces are applied to a beam of the cross section shown. Determine the maximum tensile and compressive stresses in portion BC of the beam.
2. For the composite shaped areas determine,
(a) The centroid using the composite areas method ( Y^ only )
(b) The moment of inertia of the composite areas with respect to the Y^ (Neutral) axis.
3. An air-conditioning system is shown in Fig. in which air flows over tubes carrying Refrigerant 134a. Air enters with a volumetric flow rate of 50 m3/min at 32°C, I bar, and exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat transfer at the outer surface of the air conditioner, and neglecting kinetic and potential energy effects, determine at steady state
(a) the mass flow rate of the refrigerant, in kg/min.
(b) the rate of heat transfer, in kJ/min, between the air and refrigerant.
4. A 20KN tensile force is applied to a rectangular steel specimen, determine the final length, width, and thickness, if the initial dimensions are (l = 100.0 mm, w = 20.0mm t = 5.0 mm). Assume Poisson's ratio is 0.4 and Young's Modulus is 20GPa.
