SUSTAINABLE ENERGY (LL)
2nd Edition
ISBN: 9780357667224
Author: DUNLAP
Publisher: CENGAGE L
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Textbook Question
Chapter 5, Problem 7P
Nuclide A has a half-life of 4 days, and nuclide B has a half-life of 16 days. At the beginning of an experiment, a sample contains 218 nuclei of nuclide A and 212 nuclei of nuclide B. How long will it take before the numbers of nuclei of the two nuclides are equal?
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Students have asked these similar questions
*13-12. The control linkage for a machine consists of
two L2 steel rods BE and FG, each with a diameter of 1 in.
If a device at G causes the end G to freeze up and become
pin connected, determine the maximum horizontal force
P that could be applied to the handle without causing
either of the two rods to buckle. The members are pin
connected at A, B, D, E, and F.
P
12 in.
C
G
F
B
2 in.
E
4 in.
4 in.
A
D
+
-15 in.-
+
-20 in.-
13-31. The steel bar AB has a rectangular cross section. If
it is pin connected at its ends, determine the maximum
allowable intensity w of the distributed load that can be
applied to BC without causing bar AB to buckle. Use a
factor of safety with respect to buckling of 1.5. Est = 200 GPa,
σy 360 MPa.
=
B
W
5 m
3 m
-20 mm
30 mm
x
x
A
20 mm
y
C
Problem 1:
A man-made 30 ft tall, 1.5:1 slope is to be build as shown in the figure. The soil is homogeneous
with shear strength parameters c = 400 psf and φ = 290
. The moist unit weight of the soil is 119
pcf above the groundwater table and the saturated unit weight is 123 pcf below. Using the
ordinary method of slices, compute the Factor of Safety (FS) along the trial failure surface
shown.
(Hint: Please note the unit weight is changing within the same slice.)
Note 1: Use the same number of slices and dimensions as provided. Document ALL the
calculations of weight (W) for each slice.
Note 2: Document your solutions by following the same approach illustrated in the class,
including a summary table showing all the variables and calculations involved in assessing FS.
Chapter 5 Solutions
SUSTAINABLE ENERGY (LL)
Ch. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - A sample of 137Cs (half-life = 30.1 years) decays...Ch. 5 - Prob. 4PCh. 5 - What are the decay products of the decay of the...Ch. 5 - Prob. 6PCh. 5 - Nuclide A has a half-life of 4 days, and nuclide B...Ch. 5 - 64Cu can decay by both decay and + decay. Draw an...Ch. 5 - At time t = 0 a sample contains 3.57 108 nuclei...Ch. 5 - Prob. 10P
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