The architect/engineer relies on whom for assurance that the monthly estimate of work performed as submitted by the contractor is valid?
A. No one, the architect/engineer must verify this.
B. The contractor whose estimate is guaranteed by a bonding company.
C. The resident project representative.
D. The owner.
E. a notary public.
C
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Figure 13.13 represents a tower crane used by Tomas J. Contracting to handle materials at construction sites. The weight, W, is hoisted to the desired height and then moved along the boom AE from 6 ? x ? 86. The counterweight, CW, weighs 8 500 lbm, and the crane motor and cab weigh 2 400 lbm acting at B. The crane structure weighs 5 500 lbm and can be considered to be acting at G.
Pins at C and D secure the crane base. gL = 32.174 0 ft/s².
(a) If the weight to be lifted, W, is
3 200 lbm, plot the reactions at C and D versus the distance x.
(b) Find the points where the loads at C and D are maximum and size the pins required. Each pin is in double shear and is made from stainless steel with a factor of safety of 5.0 based on ultimate strength.
(c) If the load, W, is increased to 4 200 lbm, determine if this load can be lifted safely with the pin sizes calculated and, if so, the range of x for which it is possible.
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In a move that backfired, Gorbachev tried to increase productivity by limiting sales of which commodity?
a. alcohol b. tobacco c. chairs d. chocolate
The small intestine is composed of three parts: the duodenum, the ileum, and the ____.
A. large colon B. small colon C. cecum D. jejunum
The orifice tube is usually located at the inlet tube to the ____________
A) Condenser B) Compressor C) Evaporator D) Receiver-drier