1.Select the lightest W-section for column A in the unbracedframe to carry an axial load of 60 kips dead load and 220 kips liveload. Use A992 steel (Fy=50ksi). In the plane perpendicular to theframe, the system is braced with supports at the top and bottom.Use stiffness reduction factor τ to determineeffective length k.
2.A completely reversible heat engine operates with a source at 1500 R and a sink at 500 R. At what rate must heat be supplied to this engine, in Btu/h, for it to produce 5 hp of power?
3.It is estimated that 60% of the annual precipitation in a basin with a drainage area of20,000 acres is evaporated. If the average annual river flow at the outlet (runoff) is 2.5 cfs, determine the annual precipitation in the basin. Assume seepage and transpiration are negligible and there is no storage.