1.Assuming a density of 120/ft^3 for masonry brick work, determine the max height of a brick wall if the allowable compressive stress is limited to 150#/in^2 and the brick is
a) 4" wide
b) 6" wide.
2.At what air temperature will exhaled breath condense by self-nucleation? Assume that a saturation ratio of 4.3 is required.
3.What is the equilibrium droplet size at a relative humidity of 100% for a NaCl cubic crystal 0.077 micron on a side?
4.Design a hollow steel shaft with an inside diameter 1/3 that of the outside diameter. The shaft transmits 200 kW at a speed of 20 Hz. The allowable shearing stress is 55 MPa, and the allowable angle of twist is 1 degree per meter of length.