Water flows into a swimming pool at the rate of 7.0 gal/min. The pool is 17 ft wide, 32 ft long and 7.0 ft deep. How long does it take to fill? (1 U.S. gallon = 231 cubic inches)
a. 34 hours
b. 68 hours
c. 67 hours
d. 136 hours
e. 680 hours
b
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Derive an equation for the net rate of radiant heat transfer from surface 1 in the system shown in the accompanying sketch. Assume that each surface is at a uniform temperature and that the geometrical shape factor F1–2 is 0.1.
GIVEN
? The system shown above
FIND
? An expression for the net rate of radiant heat transfer from surface 1 (q1)
ASSUMPTIONS
? Steady state
? A1 and A2 are gray, A0 is black
? Each surface is at a uniform temperature
? The shape factor F12 = 0.1
PROPERTIES AND CONSTANTS
A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?
The heavier elements like iron and nickel are abundant on Earth's surface, and the silicates dominate at the center of Earth.
Answer the following statement true (T) or false (F)
Which of the following is NOT a solution to the Fermi Paradox?
A) no one is interested or able to communicate B) we are unable to detect their communications C) we are not interested in communicating D) no one is out there