Exactly 500 grams of ice are melted at a temperature of 32°F. (LF,ice = 333 J/g.) The change in entropy (in J/K) is
A. 321.
B. 146.
C. 512.
D. 610.
E. 5230.
Answer: D
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Estimate the R-values for a 5 cm-thick fiberglass board and a 2.5 cm-thick polyurethane foam layer. Then compare their respective conductivity-times-density products if the density for fiberglass is 50 kg/m3 and the density of polyurethane is 30 kg/m3 . Use the units
GIVEN - 5 cm thick fiberglass board, density = 50 kg/m3 - 2.5 cm thick polyurethane, density = 30 kg/m3 FIND (a) R-values for both (b) Conductivity-times-density products for both ASSUMPTIONS (a) One-dimensional, steady conduction
A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, ?Q, is placed at x = 3.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on a 30-?C charge placed at the origin?
a. 7.2 N b. 3.9 N c. 1.5 N d. 14 N e. 8.1 N
Which of the following is not an advantage of the Hubble Space Telescope over ground-based telescopes?
A) It is closer to the stars. B) Stars do not twinkle when observed from space. C) It can observe infrared and ultraviolet light, as well as visible light. D) It never has to close because of cloudy skies.
Estimate the heat transfer from an object at 100ºF to a surface at 40ºF through a heat conducting media having thermal conductivity of 5 Btu/hr?ft?ºF if the shape factor is 1.0 ft.
What will be an ideal response?