MATERIALS SCIENCE+ENGINEERING:WILEY PLUS
10th Edition
ISBN: 9781119815242
Author: Callister
Publisher: WILEY
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Chapter 1, Problem 2QAP
To determine
The three items that are made from metals or their alloys. The specific metal or alloy used for each item and its characteristic.
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7.16 An abrupt silicon pn junction at 7-300 K has impurity doping concentrations of
N₁ = 5 x 10 cm³ and N = 10 cm³. Calculate (a) Vbi, (b) W at (i) VR = 0 and
(ii) VR = 5 V, and (c) [Emax | at (i) VR = 0 and (ii) VR = 5.
A semicircular 40 ft diameter− − tunnel is to be built under a150 ft deep− − , 800 ft long− − lake,
as shown below.
a) Determine the horizontal, vertical, and resulting hydrostatic forces acting on this tunnel.
(Answer: 8 8 8
1.398 10 , 2.596 10 , 2.64 10H y netF lbf F lbf F lbf= × = × = × )
b) Calculate the hydrostatic force on the bottom of the lake if the tunnel was not there, and
compare it with the total (resulting) hydrostatic force that you calculated in part (a).
(Answer: 8
2.995 10VF lbf= × )
c) As the design engineer of this tunnel would you take the hydrostatic force on the bottom
of the lake as a rough estimate of the resulting hydrostatic force acting on this tunnel.
Discuss your decision.
Chapter 1 Solutions
MATERIALS SCIENCE+ENGINEERING:WILEY PLUS
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