Many facilities that burn wood and hog waste (residues) are currently operating in the United States
What will be an ideal response?
This is correct. Wood currently meets about 2% of total energy demand.
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A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:
A) the ball becomes positively charged by induction B) the ball becomes negatively charged by induction C) the number of electrons in the ball is more than the number in the rod D) the string is not a perfect insulator E) there is a rearrangement of the electrons in the ball
What is the maximum depth from which a pump on the surface can "suck" up water?
What will be an ideal response?
The distinction between an "element" and an "isotope" is
A) an element has a specific number of both protons and neutrons; an isotope has a specific number of protons. B) an element has a specific number of neutrons; an isotope has a specific number of both protons and neutrons. C) an element has a specific number of protons; an isotope has a specific number of neutrons. D) these two words have the same meaning, but "element" is used by chemists while "isotope" is used by physicists. E) an element has a specific number of protons; an isotope has a specific number of both protons and neutrons.
Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. The current in the primary at this moment is 6 A and increasing. The current in the secondary must be:
a. 3 A. b. 6 A. c. zero. d. There is insufficient information to work this problem.