Convert the azimuths for lines AB, BC, CD, DE, and EF given in Figure 7–18 to bearings.
What will be an ideal response?
See Figure PS7–4.
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In adults, the stem cells responsible for the production of red and white blood cells originate primarily in the
A) liver. B) thymus. C) spleen. D) red bone marrow. E) yellow bone marrow.
When installing a water closet for use by a 3-year-old with a physical disability, what height should the water closet be above the finished floor?
a. 11" to 17" to top of seat b. 9½" to 10½" to rim c. 17" to 19" to top of seat d. 10½" to 13½" to rim
Which of the following have four calories per gram?
a. vitamins c. amino acids b. fats d. proteins
Change the circuit of Problem 12.28 to the circuit in Figure E.29. This is a feedback circuit which establishes a positive closed-loop voltage gain of the overall amplifier. Repeat steps (a), (b) and (c) of Problem 12.28 for the feedback circuit and compare the results. What are the important effects of feedback for this circuit?
Ri = 1 M?, Rx = 1 k?, Cx = 8 ?F, Ro = 10 ?, A0 = 106, Rf = 10 k?, Rs = 5 k?
Problem 12.28
The circuit in Figure E.28 is a simple approximate model of an operational amplifier with the inverting input grounded.
Ri = 1 M?, Rx = 1 k?, Cx = 8 ?F, Ro = 10 ?, Ao = 106
(a) Define the excitation of the circuit as the current of a current source applied to the noninverting input and define the response as the voltage developed between the noninverting input and ground. Find the transfer function and graph its frequency response. This transfer function is the input impedance.
(b) Define the excitation of the circuit as the current of a current source applied to the output and define the response as the voltage developed between the output and ground with the noninverting input grounded. Find the transfer function and graph its frequency response. This transfer function is the output impedance.
(c) Define the excitation of the circuit as the voltage of a voltage source applied to the noninverting input and define the response as the voltage developed between the output and ground. Find the transfer function and graph its frequency response. This transfer function is the voltage gain.