hw5sols - MasteringPhysics 2/27/08 1:48 PM Assignment...

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2/27/08 1:48 PM MasteringPhysics Page 1 of 14 http://session.masteringphysics.com/myct Assignment Display Mode: View Printable Answers Physics 202 Assignment 5 Due at 11:00pm on Wednesday, February 27, 2008 View Grading Details Problem 25.2 Description: A service station charges a battery using a current of I for t. (a) How much charge passes through the battery? A service station charges a battery using a current of 6.5 for 6.0 . Part A How much charge passes through the battery? Express your answer using two significant figures. ANSWER: = Problem 25.20 Description: (a) Compute the voltage drop along a l length of household no. 14 copper wire (used in 15-A circuits). The wire has diameter 1.628 mm and carries a I current. Part A Compute the voltage drop along a 33 length of household no. 14 copper wire (used in 15- circuits). The wire has diameter 1.628 and carries a 15 current. Express your answer using two significant figures. ANSWER: = Problem 25.40 Description: (a) At [. ..], what does it cost to leave a P porch light on day and night for a year? Part A At , what does it cost to leave a 27 porch light on day and night for a year? Express your answer using two significant figures. ANSWER: cost =
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2/27/08 1:48 PM MasteringPhysics Page 2 of 14 http://session.masteringphysics.com/myct Resistance and Wire Length Description: Cut a long resistor of known resistance into n identical shorter resistors. Find the resistance of the short resistors reconnected in parallel. You have been given a long length of wire. You measure the resistance of the wire, and find it to be . You then cut the wire into identical pieces . Part A If you connect the pieces in parallel as shown , what is the total resistance of the wires connected in parallel? Part A.1 Find the resistance of the wire segments A wire's resistance is proportional to its length. Find the resistance of each of the short segments of wire. Hint A.1.a Formula for the resistance of a wire The formula for the resistance of a wire in terms of its length and cross-sectional area is , where is the resistivity of the material of the wire. ANSWER: = Part A.2 Resistors in parallel For resistors in parallel of resistance for , the total resistance can be determined from the equality
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2/27/08 1:48 PM MasteringPhysics Page 3 of 14 http://session.masteringphysics.com/myct . If all resistors have the same resistance , what is the total resistance of the parallel resistors? Express your answer in terms of and . ANSWER: = Express your answer in terms of and . ANSWER: = Battery, Ammeter, and Resistors Description: Apply Kirchhoff's loop law to several series circuits containing 0, 1, or 2 identical resistors. An ammeter is connected in series to a battery of voltage and a resistor of unknown resistance . The ammeter reads a current . Next, a resistor of unknown resistance is connected in series to the ammeter, and the ammeter's reading drops to . Finally, a second resistor, also of resistance , is connected in series as well. Now the ammeter
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hw5sols - MasteringPhysics 2/27/08 1:48 PM Assignment...

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