For a converging lens with two convex surfaces, the radius of curvature for both surfaces is 20 cm. If the focal length is 10 cm, what must the index of refraction be?
a. 1.5
c. 2.0
b. 2.5
d. 3.0
C
Physics & Space Science
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Electric power lines require convective cooling from the surrounding air to prevent excessive temperatures in the wire. If a 1 inch diameter line is wrapped with nylon to increase heat transfer with the surroundings, how much nylon can be wrapped around the wire before it begins to act as an insulator? The convective heat transfer coefficient is 5 Btu/hr?ft^2 ?ºF.
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Physics & Space Science
Estimation: A reasonable estimate for the height of an ordinary adult male is
A. 50 cm. B. 70 cm. C. 200 cm. D. 300 cm.
Physics & Space Science
To which group of polymers does PVC belong?
a. Natural b. Hydrolytic c. Addition d. Condensation
Physics & Space Science
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Physics & Space Science