1. Convert 30 HP into kW. If this piece of equipment runs for 80 hours and electricity costs $0.07 per kilowatt hour, what will it cost?

2. Convert 144 square inches into square feet

3. Convert 20 gal/sf to liters per square meter

4. A tank contains 20 feet of water and is 10 feet in diameter. What is the pressure in psi at the bottom of the tank?

5. The diameter of a wet well is 10 feet. If filled to a depth of 12 feet, it will contain approximately how many gallons of water?

Answers:

1. 30 hp X 0.746 kw/hp = 22.38 kw X $0.07/kwH = $1.567/hr X 80 hrs = $125.33

2. (144 ft2) / (12 in/ft) = (12 in/sqft) / (12 in/ft) = 1 sf
(NOTE: The reason I divided by 12 in/ft twice is because 144 is square inches so to get rid of the inches I had to use 12 in/ft twice)

3. 20 gal/sqft X 3.785 L/gal = 75.7 l/sqft X 10.76 sf/1m2 = 814 L/m2

4. 20 ft X 0.433 psi/ft = 8.66 psi

5. 0.785 X 10 ft X 10 ft X 12 ft = 942 cuft OR (10 ft diameter) / (2) = 5 ft radius
3.14 X 5 ft X 5 ft X 12 ft = 942 cuft
942 cuft X 7.48 gal/cuft = 7,046 gal