1.An aerosol with a lognormal size distribution has a count median diameter of 2.0 micron and a geometric standard deviation of 2.2. If the mass concentration is 1 mg/cubic meter what is the number concentration? Assume spherical particles with density = 2500 kg/cubic metric (2.5 g/cubic centimeter)?
2.For a 30ft simply supported beam, there is a uniform load of 1.5 k/ft. along the length and two point loads of 20 kips each spaced at (from x=0 to x=30ft left to right) x=10ft and x= 20 ft. How do I find the maximum moment for the beam? (preferably using simple equations if possible)