The logic gate that generates a HIGH (1 ) output only when all of its inputs are LOW (0 ) is the:
A) NOR gate. B) AND gate. C) NAND gate. D) OR gate.
A
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When rigging a load, the center of gravity must be placed _____.
a. directly above the hook b. directly below the hook c. between the hook and the nearest outrigger d. between the hook and the load destination
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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____ trees, which lose their leaves in the winter, can be used to effectively control the solar energy striking a house.
A. Coniferous B. Evergreen C. Pine D. Deciduous
The parking brake cable can be adjusted in most cases at the _______
A) Equalizer B) Star wheel adjusters C) Link D) Strut