As the length of time a steady-state error continues, the magnitude of the integral output ____.
A. increases
B. decreases
C. does not change
Answer: A
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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 New York State, _______________ is being grown specifically as a source of nonfood, solid, biomass fuel
Fill in the blank(s) with the appropriate word(s).Cotton is mature when the bolls begin to close
Indicate whether the statement is true or false
Voltage supplied to a potentiometer may be called ________
A) Reference voltage B) Leading voltage C) Primary voltage D) None of these