Collar ties are used to prevent the rafters of the roof in Figure 14.68 from spreading. The collar ties are 1 × 6s spaced 4 feet on center and are located one-third of the distance from the ridge of the roof to the top of the walls. Determine the purchase quantity of 1 × 6 needed for the collar ties. The collar ties with be 1/3 the distance between the outsides of the walls.
What will be an ideal response?
Length = 26? / 3 = 8?8? – Use 10? long 1 × 6
Number of spaces = 36? × 0.25 spaces per foot = 9 spaces – Order 10 pieces 10? long
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Consider a house in Atlanta, Georgia, that is maintained at 22°C and has a total of 20 m2 of window area. The windows are double-door type with wood frames and metal spacers and have a U-factor of 2.5?W/m2•K (see Prob. 1–120 for the definition of U-factor). The winter average temperature of Atlanta is 11.3°C. Determine the average rate of heat loss through the windows in winter.
What will be an ideal response?
Hepatitis B is caused by a double-shelled virus.
When the glass box is unfolded, how many views are created and what are the names for these views?
What will be an ideal response?
Two technicians are discussing automotive power systems. Technician A says that today's engines operate on different principles than those of the past. Technician B says that today's engine has more computerized sensors and actuators than did an entire vehicle had in the mid-1980's. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B