Define global warming. In what ways is it a natural process? Do you believe that humans are contributing to global
warming?
What will be an ideal response?
Just as the greenhouse effect is a natural process, so is global warming. Global warming is the process that takes
place when the greenhouse effect warms the atmosphere. Global warming has been a natural process for at least
the last 5,000 years and probably for the past 15,000 years. Unfortunately, some gasses such as carbon dioxide
and methane are much more effective at trapping infrared energy and converting it to heat than are nitrogen and
oxygen. Most scientists are convinced that excess global warming results from the increases of those gasses that
have resulted from human activity. As the term is used today, global warming is generally used to refer to the excess
warming of the atmosphere over what would have occurred without human activity.
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What will be an ideal response?
If soil test results for P are available, the optimum amount of P fertilizer to apply to a crop can be best recommended by ________
A) subtracting the available soil test P from the total P uptake for the desired yield goal B) comparing the cost of P fertilizer to the yield responses measured in the past when P was applied to similar soils with similar soil test P levels C) subtracting the soil test P level measured from the soil test P level considered to be on the border of "high" and "very high" D) calculating the amount of P needed to bring the ratios of soil test P to N, P to K, and P to Mg into balance with the proper ratio for the type of soil in question E) these days, all four of the above a done, in order, by a computer program
For the ideal gas law given in Problem 6.31, if the units of P, V, m, and T are expressed in lbf/ft2, ft3, lbm, and degree Rankine (°R), respectively, what is the appropriate unit for gas constant R if the ideal gas law is to be homogenous in units?
What will be an ideal response?
What two types of governor classification are used in port-helix metering pumps?
A. Trim governors and spill governors B. Maximum speed (MS) and controlled speed (CS) C. Limiting speed (LS) and variable speed (VS). D. Port closure (PC) and port opening (PO).