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.
All ladders must extend above the top of the excavation wall by at least _____ feet.
a. 2 b. 3 c. 4 d. 5
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?
____________________ allows us to figure out approximately what the answer should be.
Fill in the blank(s) with the appropriate word(s).