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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

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? doald ods lo 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 Sbaoqa noizill0s muim NNA 6.
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? doald ods lo 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 Sbaoqa noizill0s muim NNA 6.
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