The perimeter system is most cost effective when used in

A) larger buildings. B) interior spaces.
C) older buildings. D) single story buildings.


A

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Energy costs vary greatly with energy source: coal @ $35.00/ton, gasoline @ a pump price of $2.75/gal, and electricity @ $0.100/kW·h. Conventional practice is to put these on a common basis by expressing them in $?GJ ?1. For this purpose, assume gross heating values of 29 MJ?kg?1 for coal and 37 GJ?m?3 for gasoline.

(a) Rank order the three energy sources with respect to energy cost in $?GJ ?1. (b) Explain the large disparity in the numerical results of part (a). Discuss the advantages and disadvantages of the three energy sources.

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All ladders must extend above the top of the excavation wall by at least _____ feet.

a. 2 b. 3 c. 4 d. 5

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How many cubic yards to the nearest tenth of concrete are needed for a residential walkway 34' 6" long, 4' wide, and 4" thick.

What will be an ideal response?

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____________________ allows us to figure out approximately what the answer should be.

Fill in the blank(s) with the appropriate word(s).

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