Problem 1.58* The Load and Resistance Factor Design method is to be used to select the two cables that will raise and lower a platform support¬ing two window washers. The platform weighs 160 lb and each of the window washers is assumed to weigh 195 lb with equip¬ment. Since these workers are free to move on the platform, 75% of their total weight and the weight of their equipment will be used as the design live load of each cable. (a) Assuming a resis¬tance factor ? = 0.85 and load factors ?D = 1.2 and ?L = 1.5, determine the required minimum ultimate load of one cable. (b) What is the corresponding conventional factor of safety for the selected cables?
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How does the result compare with the corresponding equation for an ideal gas?
Z = 1 + B?P + C?
+ D?
+ . . .
Derive an equation for the work of mechanically reversible, isothermal compression of 1 mol of a gas from an initial pressure 
to a final pressure 
when the equation of state is the virial expansion truncated to:
Z = 1 + B?P
Convert 2 meters to feet. Round to the nearest whole number.
The best general purpose PLC language for doing a variety of control requirements is
A) Instruction List. B) Function Block Diagrams. C) Ladder Logic. D) Sequential Function Charts. E) Structured Text.
Technician A says that before any part of the damaged structural part is removed it must be roughed out to relieve the strain from the area. Technician B says all door and window openings must be roughly restored before removing any part of the structural member. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B