6. A batch of concrete consisted if 200 lbs of aggregate,350 lbs of coarse aggregate, 94 lbs cement, and 5 gallons of water. The sp gr of sand and gravel may be taken as 2.65 and that cement is 3.10. What was the weight of concrete in place per cubic foot?
7. 100 g of water is completely mixed with 150 g of alcohol (sp gr 0.79). What is the specific gravity of the resulting mixture?
8. A certain fluid is flowing in a 0.5 m x 0.3 m channel at the rate of 3 m/s and has a specific volume of 0.0012 m3 /kg. Determine the mass of water in kg/s.