Swidden agriculture typically gives yields that are much higher than those in developed countries
What will be an ideal response?
This is the case for swidden agriculture if we refer to energy yield ratios (energy
out/energy in), because most energy input is human labor, but not if we are referring to
actual yields (in t/ha). Mechanized agriculture has far higher yields of foodstuffs per
hectare.
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Which of the following materials is most appropriate for a design requiring a material with a high magnetic susceptibility that will be subjected to an alternating magnetic field of 10 6 Hz?
(a) Fe-3 wt. % Si (b) MnO (c) Alnico-5 (d) Fe3O4
An object's mass would be the same on Earth and on the Moon, but its ______________ would be different
Fill in the blank(s) with correct word
What type of graph would be obtained when the centripetal force is plotted on the y axis and the velocity is plotted on the x axis?
An AC power generator produces 25 A (rms) at 3600 V. The energy is transmitted through a long-distance power line, which has a total resistance of 50 W. What percentage of the power delivered by the generator is dissipated as heat in the long-distance line if a step-up transformer is not used?
a. 69% c. 0.09% b. 35% d. 1.8%