As an energy-efficiency consultant, you’re asked to assess a pumped-storage facility. Its reservoir sits 160 m above its gen- erating station and holds 7.6 × 10° kg of water. The power plant generates 310 MW of electric power while draining the reser- voir over an 8.0-h period. Its efficiency is the percentage of the stored potential energy that gets converted to electricity. What efficiency do you report? EEO.0
As an energy-efficiency consultant, you’re asked to assess a pumped-storage facility. Its reservoir sits 160 m above its gen- erating station and holds 7.6 × 10° kg of water. The power plant generates 310 MW of electric power while draining the reser- voir over an 8.0-h period. Its efficiency is the percentage of the stored potential energy that gets converted to electricity. What efficiency do you report? EEO.0
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NO.54

Transcribed Image Text:32. In 1onic solids such as NaCI (salt), the potential energy of a pair
blr" – alr, where r is the separation
of the ions. For NaCl, a and b have the SI values 4.04×10-28 and
8.22. Find the equilibrium
CH
of ions takes the form U
-
Exe .52X10", respectively, and n
separation in NaCl.
53. Repeat Exercise 17 for the case when the coefficient of kinetic
friction on both slopes is 0.11, while the level stretches remain
Secti frictionless.
54. As an energy-efficiency consultant, you’re asked to assess a
ENV pumped-storage facility. Its reservoir sits 160 m above its gen-
erating station and holds 7.6 X 10° kg of water. The power plant
generates 310 MW of electric power while draining the reser-
voir over an 8.0-h period. Its efficiency is the percentage of the
stored potential energy that gets converted to electricity. What
* Defficiency do you report?
55. A spring of constant k
block along a horizontal surface whose coefficient of sliding fric-
tion is 0.29. If the spring is compressed 22 cm, how far does the
290 N/m is used to launch a 1.9-kg
block slide?
56. A bug slides back and forth in a bowl 12 cm deep, starting from
rest at the top, as shown in Fig. 7.20. The bowl is frictionless
except for a 1.8-cm-wide sticky patch on its flat bottom, where
the coefficient of friction is 0.83. How many times does the bug
cross the sticky region?
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OCiated wi
Washington
fornia, 86 m
mud ot Ho bual
w nojalogA
ylleiino ns212 cm
ob ovuoYdt.no
64
Imslenos
1.8 cm
CH
mo 0.0 o1 qu
FIGURE 7.20 Problem 56
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