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I Review In a hydroelectric dam, water falls 28.0 m and then spins a turbine to generate electricity. You may want to review (Page) Part A What is AU of 1.0 kg of water? Express your answer with the appropriate units. -274 J Submit Previous Answers v Correct Here we learn how to find the change in potential energy of a mass if we know the change in height. Part B Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 47.0 MW of electricity? This is a typical value for a small hydroelectric dam. Express your answer using three decimal places. ? kg/s Submit Request Answer

I Review In a hydroelectric dam, water falls 28.0 m and then spins a turbine to generate electricity. You may want to review (Page) Part A What is AU of 1.0 kg of water? Express your answer with the appropriate units. -274 J Submit Previous Answers v Correct Here we learn how to find the change in potential energy of a mass if we know the change in height. Part B Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 47.0 MW of electricity? This is a typical value for a small hydroelectric dam. Express your answer using three decimal places. ? kg/s Submit Request Answer

University Physics Volume 1
University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter8: Potential Energy And Conservation Of Energy
Section: Chapter Questions
Problem 81AP: Repeat the preceding problem, but this time, suppose that the work done by air resistance cannot be...
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1. Can you please fill in the blanks for the first question and explain it. 

2. For the second picture, I am having trouble calculating an answer for part 2

Thank you 

I Review In a hydroelectric dam, water falls 28.0 m and then spins a turbine to generate electricity. You may want to review (Page) Part A What is AU of 1.0 kg of water? Express your answer with the appropriate units. -274 J Submit Previous Answers v Correct Here we learn how to find the change in potential energy of a mass if we know the change in height. Part B Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 47.0 MW of electricity? This is a typical value for a small hydroelectric dam. Express your answer using three decimal places. kg/s Submit Request Answer
Transcribed Image Text:I Review In a hydroelectric dam, water falls 28.0 m and then spins a turbine to generate electricity. You may want to review (Page) Part A What is AU of 1.0 kg of water? Express your answer with the appropriate units. -274 J Submit Previous Answers v Correct Here we learn how to find the change in potential energy of a mass if we know the change in height. Part B Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 47.0 MW of electricity? This is a typical value for a small hydroelectric dam. Express your answer using three decimal places. kg/s Submit Request Answer
I Review You need to raise a heavy block by pulling it with a massless rope. You can either (a) pull the block straight up height h, or (b) pull it up a long, frictionless plane inclined at a 15° angle until its height has increased by h. Assume you will move the block at constant speed either way. Will you do more work in case a or case b? Or is the work the same in both cases? Explain. Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help do the same work against You Thus, Wa is Wh gravity in both cases. do the same work against gravity but you also do work through a horizontal displacement in case (b). exert less force on the block in case (b). pull the block through a less displacement in case (a). greater than equal to less than
Transcribed Image Text:I Review You need to raise a heavy block by pulling it with a massless rope. You can either (a) pull the block straight up height h, or (b) pull it up a long, frictionless plane inclined at a 15° angle until its height has increased by h. Assume you will move the block at constant speed either way. Will you do more work in case a or case b? Or is the work the same in both cases? Explain. Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help do the same work against You Thus, Wa is Wh gravity in both cases. do the same work against gravity but you also do work through a horizontal displacement in case (b). exert less force on the block in case (b). pull the block through a less displacement in case (a). greater than equal to less than
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