One of the least environmental concerns with incineration of waste is
a. emission of dioxins
b. particulate emissions
c. heat addition to rivers
d. metal concentrations in ash
c
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The 1560-kg solid steel door to a bank vault is 2.00 m high, 1.00-m wide and 10-cm thick. One hinge is 60.0 cm down from the top on the left-hand side of the door. The other hinge is 30.0 cm up from the bottom. What horizontal force, in what direction, does the door exert on the lower hinge?
A. 6950 N, left B. 6950 N, right C. 7640 N, left D. 7640 N, right E. 15,300 N, left
The fact that ?mT = 2.9 × 10-3 m-K is known as
A) Maxwell's law. B) Planck's law. C) Bohr's law. D) de Broglie's law. E) Wien's law.
Based on current evidence, how does the actual average density of matter in the universe compare to the critical density?
A) The actual density, even with dark matter included, is less than about a third of the critical density. B) If we include dark matter, the actual density equals the critical density. C) The actual density of dark matter and luminous matter combined is no more than about 1% of the critical density. D) The actual density of matter is many times higher than the critical density.
In a double-slit experiment, when both interference and diffraction are taken into account, which is the lowest order maximum that is missing in the case where the slit separations is 0.020 mm and the slit widths are each 0.005 mm?
A. 1 B. 2 C. 3 D. 4 E. no order is missing