Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Chapter 7, Problem 26Q
(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.)
. A simple electric circuit consists of a constant-voltage power supply and a variable resistor. What effect does reducing the resistance have on the current in the circuit and on the power output of the power supply?
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In one of the videos I said that a typical American household uses energy at a rate of about 10,000 joules per second. A shorthand unit for this would be "10 kilowatts". Using energy at this rate costs about $1.50 per hour (this is not quite right, as it assumes that all the energy is electrical energy, which is relatively cheap, but let's go with this for an estimate). How much does this energy usage cost for a year?
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Chapter 7 Solutions
Inquiry into Physics
Ch. 7 - Describe one promising explanation for how...Ch. 7 - Loud thunder claps frequently accompany lightning...Ch. 7 - What does the term fibrillation mean in connection...Ch. 7 - Prob. 1PIPCh. 7 - Prob. 2PIPCh. 7 - Prob. 1MIOCh. 7 - Prob. 2MIOCh. 7 - Prob. 1QCh. 7 - Prob. 2QCh. 7 - Prob. 3Q
Ch. 7 - Prob. 4QCh. 7 - Prob. 5QCh. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 7QCh. 7 - Prob. 8QCh. 7 - Prob. 9QCh. 7 - Prob. 10QCh. 7 - Prob. 11QCh. 7 - Prob. 12QCh. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 14QCh. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 16QCh. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 19QCh. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 24QCh. 7 - Prob. 25QCh. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 29QCh. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 32QCh. 7 - Prob. 33QCh. 7 - Prob. 34QCh. 7 - (Indicates a review question, which means it...Ch. 7 - Two charged particles exert an electric force of...Ch. 7 - What would the separation between two identical...Ch. 7 - A particle having a positive charge of C...Ch. 7 - During 30 seconds of use, 250 C of charge flow...Ch. 7 - A lightning stroke lasts 0.05 s and involves a...Ch. 7 - A current of 0.7 A goes through an electric motor...Ch. 7 - A calculator draws a current of 0.0001 A for 5...Ch. 7 - Prob. 8PCh. 7 - A 120-V circuit in a house is equipped with a 20-A...Ch. 7 - . The resistance of each brake lightbulb on an...Ch. 7 - . The lightbulb used in a computer projector has a...Ch. 7 - Prob. 12PCh. 7 - Prob. 13PCh. 7 - Prob. 14PCh. 7 - . An electric eel can generate a 400-V, 0.5-A...Ch. 7 - . An electric train operates on 750 V. What is its...Ch. 7 - . All of the electrical outlets in a room are...Ch. 7 - . Your cell phone typically consumes about 400 mW...Ch. 7 - . A car’s headlight consumes 40 W when on low beam...Ch. 7 - . Find the current that flows in a 40-W bulb used...Ch. 7 - . An electric clothes dryer is rated at 4,000 W....Ch. 7 - . A clock consumes 2 W of electrical power. How...Ch. 7 - . Which costs more, running a 1,200-W hair dryer...Ch. 7 - . A representative lightning strike is caused by a...Ch. 7 - Prob. 25PCh. 7 - . A certain electric motor draws a current of 10 A...Ch. 7 - . The generator at a large power plant has an...Ch. 7 - . A lightbulb is rated at 60 W when connected to...Ch. 7 - . About 40,000 J of energy is stored in a typical...Ch. 7 - . An electric car is being designed to have an...Ch. 7 - Prob. 31PCh. 7 - Compute the electric force acting between the...Ch. 7 - Use the result from Challenge land the equation...Ch. 7 - Prob. 3CCh. 7 - Using your understanding of the nature of internal...Ch. 7 - The current that flows through an incandescent...Ch. 7 - Prob. 6CCh. 7 - Imagine a company offering a line of hair dryers...Ch. 7 - Prob. 8CCh. 7 - Combine Ohm’s law and the equation for power...Ch. 7 - A defibrillator sends approximately 0.1 C of...
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