?In____, air pressures of over 2.7 MPa may be used to blow a hot plastics sheet through the silhouette of a female mold.
A. ?snap-back forming
B. ?twin sheet thermoforming
C. ?free forming
D. ?mechanical forming
Answer: C
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The seventh stage of drawing sections is ____.
A. verifying scope B. establishing expectations C. establishing limits D. evaluating your work
Someone leaves a 100-W light bulb on before leaving and sealing up a 2 m x 4 m x 4 m room full of air. Initially the air temperature is 20oC, and the air pressure is 100 kPa. Assuming that the mass of the air in the room stays constant and ignoring any pressure changes
(a) determine the temperature of the air in the room after 8 hours. (b) What would the temperature of the room be after 8 hours if someone had also left a 50-W fan operating in the room at the same time? Given: Air; L = 4m; W = 4m; H = 2m; T1 = 20oC = 293 K; W?=?0.1 kW; P = 100 kPa; t = 8 hours Assume: Q = 0 (insulated); ?KE = ?PE = 0 Air behaves as an ideal gas with constant specific heats: cv = 0.718 kJ/kg-K R = 0.287 kJ/kg-K P = constant; m = constant What will be an ideal response?
In the accompanying figure, the electrical symbol at the top stands for a ____.
A. circuit breaker B. fusible element C. single-throw knife switch D. ground
Determine the slope of a foundation trench 34' long × 16" wide × 16" deep with an elevation change of 1'-6"
A) 7.1% slope B) 6.2% slope C) 8.5% slope D) 4.4% slope