What are the positive and negative environmental impacts of using ethanol as a gasoline supplement?
What will be an ideal response?
Ethanol is a gasoline additive that can reduce the amount of oil used, however it is a hydrocarbon, so burning it produces carbon dioxide, however it is equivalent to the carbon dioxide absorbed by the plant during growing, so the net effect is carbon neutral in the long term. Negative impacts include agricultural land taken out of production for food, water and fertilizer requirements; single crop farming requires use of increased pesticides, and there can be loss of wildlife habitat.
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For each comparison listed below, indicate if a one-tailed or two-tailed statistical test is appropriate to determine whether: ? speeds after enactment of a lower speed limit are less than before ? speeds on an urban highway are different during peak or non-peak times ? the 85th percentile speed on a highway is greater than the speed limit
What will be an ideal response?
Compare and contrast the various tubes described in boiler operation.
What will be an ideal response?
Acetylene should never be used:
A) Below 15 psi. B) Below 20 psi. C) Above 20 psi. D) Above 15 psi.
After brazing a joint in a very tight location, the technician would use an _________________________ to determine if the joint is properly brazed.
Fill in the blank(s) with the appropriate word(s).