Any compound that contains carbon is considered
to be
a)a polymer compound
b)a CFC compound.
c)an organic compound.
d)a hydroxyl compound.
c
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In a lead-shot tower, spherical 0.95-cm-diameter BB shots are formed by drops of molten lead which solidify as they descend in cooler air. At the terminal velocity, i.e., when the drag equals the gravitational force, estimate the total heat transfer coefficient if the lead surface is at 171°C, the surface of the lead has an emissivity of 0.63, and the air temperature is 16°C. Assume CD = 0.75 for the first trial calculation.
GIVEN
• Spherical lead-shot falling through the air at terminal velocity
• Shot diameter (D) = 0.95 cm = 0.0095 m
• Lead surface temperature (Ts) = 171°C = 494 K
• Lead surface emissivity (?) = 0.63
• Air temperature (T?) = 16°C 289 K
• Assume CD = 0.75 for the first trial calculation FIND
• The total average heat transfer coefficient (htotal). ASSUMPTIONS
• The surroundings act as a black body enclosure at T?
SKETCH
The Atacama Large Millimeter Array achieves exceptional resolution by using exceptionally:
A) large radio antennas in a fixed array. B) large radio antennas in a mobile array. C) many radio antennas in a fixed array. D) many radio antennas in a mobile array. E) many portions of the electromagnetic spectrum.
A diffraction grating has 300 lines per mm. If light of wavelength 630 nm is sent through this grating, at what angle does the first order maximum occur?
A) 56° B) 44° C) 22° D) 11° E) 28°
Which of the following is not evidence for plate tectonics on Earth?
A) some continental boundaries fit together like pieces of a jigsaw puzzle B) similar rocks and fossils are found in different continents C) high ocean ridges between the continents D) existence of volcanoes E) earthquakes