Chapter 25 Homework.pdf - Chapter 25 Due 8:00am on Monday...

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Chapter 25 Due: 8:00am on Monday, October 15, 2018 You will receive no credit for items you complete after the assignment is due. Grading Policy Exercise 25.4 An 18-gauge copper wire (diameter 1.02 ) carries a current with a current density of 2.90 10 . The density of free electrons for copper is 8.5 10 electrons per cubic meter. Part A Calculate the current in the wire. Express your answer with the appropriate units. ANSWER: Correct Part B Calculate the magnitude of the drift velocity of electrons in the wire. Express your answer with the appropriate units. ANSWER: Correct Exercise 25.43 The capacity of a storage battery, such as those used in automobile electrical systems, is rated in ampere-hours . A 50 battery can supply a current of 50 for 1.0 , or 25 for 2.0 , and so on. Part A What total energy can be supplied by a 10 , 70 battery if its internal resistance is negligible? Express your answer using two significant figures. ANSWER: Correct = 2.37 = 0.21 = 2.5×10 6
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Part B What volume (in liters) of gasoline has a total heat of combustion equal to the energy obtained in part (a)? (See Section
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