Essential University Physics: Volume 2 (3rd Edition)
3rd Edition
ISBN: 9780321976420
Author: Richard Wolfson
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 24, Problem 25E
The “third rail” that carries electric power to a subway train is an iron bar whose rectangular cross section measures 10 cm by 15 cm. Find the resistance of a 5.0-km length of this rail.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
A copper wire of length L = 4000 meters has a uniform cross sectional area of A = 1.00 x 10-5 m2. The resistively of copper is 1.72 x 10-8 ohm meters. The resistance of the wire (in ohms) is
1.72
.86
6.88
3.44
The resistance of a rod with a length of 3.0 m and a diameter of 1.0 cm is 56.0 Ω. If this rod is stretched to form a wire with a diameter of 0.01 cm, what is its resistance? Assume that in the process of stretching the rod, its volume did not change.
(Thank you!)
The length of a 200 m lead wire has a resistance of 1.7 Ω. If the
cross section of this wire is 3.0 × 10 -6 m 2, of what material the conductor
is it made up?
Chapter 24 Solutions
Essential University Physics: Volume 2 (3rd Edition)
Ch. 24.1 - Prob. 24.1GICh. 24.2 - Two wires carry the same current I. Wire A has a...Ch. 24.3 - Prob. 24.3GICh. 24.4 - You put a variable resistance across a battery...Ch. 24.5 - Todays power tools are often cordless, powered by...Ch. 24 - Explain the difference between current and current...Ch. 24 - A constant electric field generally produces a...Ch. 24 - When caught in the open in a lightning storm, a...Ch. 24 - Good conductors of electricity are often good...Ch. 24 - Why can current persist forever in a...
Ch. 24 - Does an electric stove burner draw more current...Ch. 24 - A person and a cow are standing in a field when...Ch. 24 - You put a 1.5-V battery across a piece of...Ch. 24 - Prob. 9FTDCh. 24 - A 50-W and a 100-W lightbulb are both designed to...Ch. 24 - Equation 24.8a suggests that no power can be...Ch. 24 - Whats wrong with this news report: A power-line...Ch. 24 - A wire carries 1.5 A. How many electrons pass...Ch. 24 - A 12-V car battery is rated at 80 ampere-hours,...Ch. 24 - Biologists measure the total current due to...Ch. 24 - The National Electrical Code specifies a maximum...Ch. 24 - The electric field in an aluminum wire is 85 mV/m....Ch. 24 - What electric field is necessary to drive a 7.5-A...Ch. 24 - Prob. 19ECh. 24 - A 1.0-cm-diameter rod carries a 50-A current when...Ch. 24 - Use Table 24.1 to determine the conductivity of...Ch. 24 - Find the resistance of a heating coil that draws...Ch. 24 - Prob. 23ECh. 24 - Whats the current in a 47-k resistor with 110 V...Ch. 24 - The third rail that carries electric power to a...Ch. 24 - What current flows when a 45-V potential...Ch. 24 - A uniform wire of resistance R is stretched until...Ch. 24 - A cars starter motor draws 125 A with 11 V across...Ch. 24 - A 4.5-W flashlight bulb draws 750 mA. (a) At what...Ch. 24 - A watch uses energy at the rate of 240 W. What...Ch. 24 - A 35- electric stove burner consumes 1.5 kW of...Ch. 24 - An incandescent lightbulb draws 0.50 A, while a...Ch. 24 - Though rare, electrocution has been reported under...Ch. 24 - You touch a defective appliance while standing on...Ch. 24 - You have a typical resistance of 100 k. (a) How...Ch. 24 - An ion channel in a cell membrane carries 2.4 pA...Ch. 24 - A lightbulb filament has diameter 0.050 mm and...Ch. 24 - A gold film in an integrated circuit measures 1.85...Ch. 24 - A copper wire joins an aluminum wire whose...Ch. 24 - Prob. 40PCh. 24 - In a study of proteins mediating cell membrane...Ch. 24 - Theres a 2.5-V potential difference between...Ch. 24 - The maximum safe current in 12-gauge...Ch. 24 - Silver and iron wires of the same length and...Ch. 24 - You have a cylindrical piece of material 2.4 cm...Ch. 24 - How must the diameters of copper and aluminum wire...Ch. 24 - Youre writing the instruction manual for a power...Ch. 24 - An implanted pacemaker supplies the heart with 72...Ch. 24 - A solid rectangular iron bar measures 0.50 cm by...Ch. 24 - Each pulse produced by the Taser described in the...Ch. 24 - The Nissan Leaf is an all-electric car powered by...Ch. 24 - An electric heater is tested by immersing it in...Ch. 24 - Magnetic effects involving Jupiters moon Io result...Ch. 24 - At a particular point in a material with...Ch. 24 - A thermally insulated container of seawater...Ch. 24 - Youre heading out for spring break, but your car...Ch. 24 - Two cylindrical resistors are made from the same...Ch. 24 - Youre working on a new high-speed rail system. It...Ch. 24 - A 100%-efficicnt electric motor is lifting a 15-N...Ch. 24 - A power plant produces 1000 MW to supply a city 40...Ch. 24 - Youre estimating costs for a new power line with...Ch. 24 - A 240-V electric motor is 90% efficient, meaning...Ch. 24 - A metal bar has rectangular cross section 5.0 cm...Ch. 24 - An immersion-type heating coil is connected to a...Ch. 24 - The resistivity of copper as a function of...Ch. 24 - Each atom in aluminum contributes about 3.5...Ch. 24 - Prob. 67PCh. 24 - Figure 24.20 shows a truncated cone of material...Ch. 24 - The current density in a particle beam with...Ch. 24 - Prob. 70PCh. 24 - You work for an automobile manufacturer developing...Ch. 24 - During the brownout, the current in conductors...Ch. 24 - Which of the following occurs in the conductors of...Ch. 24 - During the brownout, the power dissipated in...Ch. 24 - Prob. 75PP
Additional Science Textbook Solutions
Find more solutions based on key concepts
The correct option.
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
9. (Il) Three vectors are shown in Fig. 3—35 Q. Their magnitudes are given in arbitrary units. Determine the su...
Physics: Principles with Applications
The rocket engines of our current spacecraft are powered by (a) chemical energy; (b) nuclear energy; (c) matter...
Life in the Universe (4th Edition)
12. A falcon is hovering above the ground, then suddenly pulls in its wings and begins to fall toward the groun...
College Physics: A Strategic Approach (4th Edition)
A physics student, bored by a lecture on simple harmonic motion, idly picks up his pencil (mass 8.65 g, length ...
Essential University Physics: Volume 1 (3rd Edition)
An objects acceleration increases quadratically with time; a(t) = bt2, where b = 0.041 m/s4. If the object star...
Essential University Physics (3rd Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Gold is the most ductile of all metals. For example, one gramof gold can be drawn into a wire 2.40 km long. The density ofgold is 19.3 x 103 kg/m3, and its resistivity is 2.44 x 10-8 Ω ⋅ m.What is the resistance of such a wire at 20.0°C?arrow_forwardSome states allow the use of aluminum wire in houses in place of copper. If you wanted the resistance of your aluminum wires to be the same as that of copper, calculate the ratio of the thickness of the aluminum wire to the copper wire. (ρAl = 2.82 x 10-8 Ω-m and ρCu = 1.72 x 10-8 Ω-m)arrow_forwardA metal wire has a resistance of 10.0 l at a temperature of 20.0 ° C . If the same wire has a resistance of 10.6 lat 90.0 ° C , what is the resistance of this wire when its temperature is 220.0 ° C ?arrow_forward
- A toaster has a Nichrome (a-4.5x10 °c) heating element that has a resistance of Ro= 80 n at a temperature T-20 °C. When the toaster is turned on, the resistance of the element rises to 89.1 2 and its temperature is increased. Find the final temperature (in °C) of the heating element.arrow_forwardThe instructions for an electric lawn mower suggest that a 20-gauge extension cord can be used for distances up to 35 m, but a thicker 16-gauge cord should be used for longer distances, to keep the resistance of the wire as small as possible. The cross-sectional area of 20-gauge wire is 5.2 × 10 -7 m², while that of 16-gauge wire is 13 x 10 –7 m². Determine the resistance of: (a) 35 m of 20-gauge copper wire and (b) 75 m of 16-gauge copper wire.arrow_forwardGold is the most ductile of all metals. For example, one gram of gold can be drawn into a wire 2.40 km long. What is the resistance of such a wire at 20°C?arrow_forward
- A long uniform rod of electrically resistive material has a resistance of Roriginal =1Ω. The rod is cut into N equal short pieces which are bundled side-by-side so that the short pieces are parallel to each other. The resistance of the bundled short rods is Rnew = 0.04Ω. What is the value of N? (i.e., how many pieces was the original rod cut into?)arrow_forwardTwo cylindrical bars that have the same length of 1.30 m, are welded together in parallel. One bar is made of copper and has a diameter of 1.20 cm. The other bar is made of iron and has a diameter of 2.10 cm. What is the resistance of the welded bars?arrow_forwardA given copper wire has a resistance of 5.20 2 at 20.0°C while a tungsten wire of the same diameter has a resistance of 4.63 2 at 20.0°C. At what temperature will the two wires have the same resistance? 153 °C Need Help? Read Itarrow_forward
- A cable consists of 10 strands of gauge no. 10 copper wire with a diameter of 0.5m. What is the resistance of 5km of this cable at 20 degrees celcius?arrow_forwardHigh-voltage power lines are a familiar sight throughout the country. Thealuminum wire used for some of these lines has a cross-sectional area of4.9 x 10 -4 m 2 . What is the resistance of ten kilometers of this wire?arrow_forwardCalculate the resistance of an annealed copper wire of 710 m long and a diameter of 128 mils at 20 0 C. What will be the resistance of this wire if it is drawn down to one-half of the cross-section without change in volume and material? Please answer with a complete solution.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON
College Physics
Physics
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
University Physics (14th Edition)
Physics
ISBN:9780133969290
Author:Hugh D. Young, Roger A. Freedman
Publisher:PEARSON
Introduction To Quantum Mechanics
Physics
ISBN:9781107189638
Author:Griffiths, David J., Schroeter, Darrell F.
Publisher:Cambridge University Press
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:9780321820464
Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:Addison-Wesley
College Physics: A Strategic Approach (4th Editio...
Physics
ISBN:9780134609034
Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:PEARSON
Ohm's law Explained; Author: ALL ABOUT ELECTRONICS;https://www.youtube.com/watch?v=PV8CMZZKrB4;License: Standard YouTube License, CC-BY