One of the larger problems in municipal recycling programs is
a. public awareness
b. finding markets for materials
c. net energy used in recycled material preparation
d. declining number of landfills
b
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A 200 ft. high by 60 ft. wide building is on fire, and one of its walls is at 1500ºF. Air at 100ºF and 40% relative humidity is near the building as shown in the figure. Estimate the net heat transfer to the air from this burning wall if the wall’s emissivity is 0.85.
Astronomers build telescopes on tops of mountains because
a. there is less air to dim the light. b. the seeing is better. c. CCDs work better when there is less oxygen in the air. d. all of the above e. a and b
Thin Films: An oil film with refractive index 1.48 and thickness 290 nm is floating on water and illuminated with white light at normal incidence. What is the wavelength of the dominant color in the reflected light?
A. green (541 nm) B. blue-green (493 nm) C. violet (404 nm) D. yellow (572 nm) E. blue (470 nm)
Since accelerations are equivalent to gravity, a person could cancel the effects of Earth's gravity by
A) falling from a high place. B) going into orbit around Earth. C) Both of the above. D) accelerating straight upward at an acceleration of 1g. E) Nonsense--you can't cancel the effects of gravity.