If the R-value of a wall is 10 ft2-?F-hr/Btu, then the rate of heat transfer through a 2 ft × 3 ft section of wall, with ?T = 50°F, will be:

a. 10 b. 30 c. 500 d. 3000 e. 10,000 Btu/hr


b

Physics & Space Science

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If the electric flux through a closed surface is zero, the electric field at points on that surface must be zero

A) True B) False

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Indicate whether the statement is true or false

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