____ septic systems mechanically inject air into a waste collection tank, encouraging decomposition, which provides a higher quality effluent.
A. Mechanical
B. Injection
C. Anaerobic
D. Aerobic
Answer: D
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The cost of equipment to apply epoxy paint to a warehouse floor is $1400. Materials and supplies (masking tape, surface repair material, solvents, cleanup supplies, etc.) will cost $2.03 per ft². Alternatively, a contractor can be hired annually to do the job for $3.25 per ft². If the cost of the equipment will be recovered at i = 10% per year over a 3-year period with no salvage value, the number of square feet that must be treated each year to justify the equipment purchase is closest to: (choose one)
(a) 460 ft² (b) 953 ft² (c) 1148 ft² (d) 2457 ft²
Why does a pressure drop not necessarily indicate a refrigerant leak?
A) It may be indicating temperature change. B) It may be indicating nitrogen presence. C) It may be indicating atmospheric pressure. D) It may be indicating system shutoff.
The swelling/shrinking tendency of some silicate clay minerals is due primarily to _____.
a. the high Mg2+ contents in the octahedral layers b. the movement of water molecules in and out of the interlayers of the crystal c. the presence of cations attracted by the negative charges on the internal surfaces d. substitution of Si4+ in the tetrahedral layers
Calculate the change in the momentum of a car, whose speed changes from 100 km/h to 20 km/h. The car has a mass of 1000 kg and is moving along a straight line. Express your answer in SI, BG, and U.S. Customary units.
What will be an ideal response?