Calculate the ground-level downwind center-line concentration of SO2 10 km from the source. The effective stack height is 90 m, the wind speed at stack is 5 m/s, and the emission rate is 0.25 kg/s. The atmosphere has neutral stability. Note: Necessary tables, figures, and equations can be found in 'Air Resources' lecture slides
a. 190 mg/m^3
b. 175 pg/m^3
c. 120 mg/m^3
d. 200 ug/m^3

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length