The mean free path where commercial aircraft fly (about 30,000 ft) is nearest:
(A) 0.0076 mm
(B) 0.0026 mm
(C) 0.00076 mm
(D) 0.00016 mm
(C) 0.00076 mm
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Which geometrical shape has the least surface area for a given volume?
A) cube B) pyramid C) cylinder D) sphere E) none of the above
Fresnel lenses are
a. made of mirror segments. b. made of the surface portions of a regular lens. c. found in some auto headlamps and theater lights and rear windows of RVs. d. all of the above.
Fragmenting during meteorite impacts caused the breccias found among the lunar samples
Indicate whether the statement is true or false
Lydia proposes to send an interstellar probe off in stages. The first stage, traveling radially outward at 0.500c relative to Earth, will send off a second stage traveling in the same direction as the first stage at a speed of 0.500c relative to the first stage. Finally, the second stage will send off a third stage traveling in the same direction at 0.500c relative to the second stage. Relative to Earth, the speed of the third stage will have a magnitude of
A. 0.500c. B. 0.800c. C. 0.929c. D. 0.972c. E. 1.500c.