It is energetically feasible to use more logging residue for energy. There is a large amount available. What reasons, if any, are there against using this resource? Explain
What will be an ideal response?
The residue, if left in place, can contribute to soil fertility. Retention of organic
matter enhances subsequent productivity. Removal of all ground cover, characteristic of
clearcutting, can have adverse effects on the soil and hinder reestablishment of the local
ecosystem.
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What is supercritical reaction?
a. A reaction in a nuclear reactor that is about to fail because of fuel depletion. b. A chain reaction that would simply die out because not enough neutrons are being absorbed by uranium-235. c. A chain reaction that grows rapidly because an average of more than one neutron from each fission reaction causes another fission reaction. d. A chain reaction based on plutonium. e. One that can continue indefinitely.
The Greek approach to understanding the universe relied mostly on
A) observations B) experiments C) thought and intuition D) preconceived ideas
If a charge of -3 x 10-6 C were allowed to fall through a potential difference of +500 V, the change in potential energy for the charge would be
A. -1.5 × 10-3 Joules. B. 1.5 × 10-4 Joules. C. -1.5 × 10-4 Joules. D. 1.5 × 10-3 Joules.
Which of the following terms describe lenses that are thicker at the center than at the edges? (There could be more than one correct choice.)
A) converging lenses B) diverging lenses C) concave lenses D) convex lenses