5th Edition

ISBN: 9780321992277

Author: GIANCOLI

Publisher: PEARSON

Concept explainers

A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine par…

Kinetic Energy and Work-Energy Theorem

In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the d…

Videos

Textbook Question

Chapter 7.1, Problem 1BE

Return to the Chapter-Opening Question, page 163, and answer it again now. Try to explain why you may have answered differently the first time.

CHAPTER-OPENING QUESTION—Guess now!

You push very hard on a heavy desk, trying to move it. You do work on the desk:

(a) Whether or not it moves, as long as you are exerting a force.
(b) Only if it starts moving.
(c) Only if it doesn’t move.
(d) Never—it does work on you.
(e) None of the above.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 7.1, Problem 1AE

Chapter 7.4, Problem 1CE

Students have asked these similar questions

• Nature of Resistance Temperature-Resistance Relationship Ohm's Law, Energy and Power Kirchhoff's Law • • Maxwell's Mesh Analysis 1. The steel of the third rail of a railway system has a resistivity of 21.4 μ-cm. If its cross-sectional area is 8.2 in², calculate the resistance per mile of rail, neglecting the effect of joints between sections. (1 point) 2. An incandescent lamp has a tungsten filament whose resistance is 96 at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source, under which condition its temperature is 24°C. (Use do = 0.0045 02/°C for tungsten) (1 point) 3. For the circuit shown, find the following: 50 V 602 10 V 702 a. the value of resistor R. (1 point) b. the equivalent resistance with respect to the 50-V source. (1 point) 4. For the circuit shown, determine all the currents in each branch using Kirchhoff's Laws. (3 points) A 5V 2 В -ний C 4 6 VT ww F E 5. Use Maxwell's Mesh to find I, and VAB…

For items 8-9, refer to the problem below. Find all the currents flowing in every resistor, power dissipation in every resistor and the total power of the circuit shown at the right using... 8. Kirchhoff's Laws (5 pts) 9. Maxwell's Mesh Analysis (5 pts) A 8 V 10 V B + 20 Ω 3Ω 202 wwww C wwww 202 + 50 www 12 V

• Nature of Resistance Temperature-Resistance Relationship Ohm's Law, Energy and Power Kirchhoff's Law • Maxwell's Mesh Analysis 1. A coil of copper wire (p = 10.37 2-cmil/ft) has a length of 600 ft. What is the length of an aluminum conductor (p 17 cmil/ft), if its cross-sectional area and resistance are the same as those of the copper coil? (Hint: Look for conversion of inches to mils and square inches to square foot. Include it in your solution.) (1 pt) 2. The copper field winding of an electric machine has a resistance of 46 at temperature of 22°C. What will be its resistance at 75°C? (Use do = 0.00427 /°C for copper) (1 pt) 3. The resistivity of a copper rod 50 ft long and 0.25 inch in diameter is 1.76 μ at 20°C. What is its resistance at - 20°C? (1 pt) 4. When two resistors A and B are connected in series, the total resistance is 36 2. When connected in parallel, the total resistance is 8 Q. What is the ratio of the resistance RA to resistance RB? Assume RA < RB. (1 pt) 5. The…

Chapter 7 Solutions

PHYSICS F/SCI.+ENGINEERS W/MOD.PHYSICS

Ch. 7.1 - A box is dragged a distance d across a floor by a...Ch. 7.1 - Return to the Chapter-Opening Question, page 163,...Ch. 7.4 - (a) Make a guess: will the work needed to...Ch. 7.4 - Can kinetic energy ever be negative?Ch. 7.4 - Prob. 1EE Ch. 7 - In what ways is the word work as used in everyday...Ch. 7 - A woman swimming upstream is not moving with...Ch. 7 - Can a centripetal force ever do work on an object?...Ch. 7 - Why is it tiring to push hard against a solid wall...Ch. 7 - Does the scalar product of two vectors depend on...

Ch. 7 - Can a dot product ever he negative? If yes, under...Ch. 7 - Prob. 7Q Ch. 7 - Does the dot product of two vectors have direction...Ch. 7 - Can the normal force on an object ever do work?...Ch. 7 - You have two springs that are identical except...Ch. 7 - Prob. 11Q Ch. 7 - In Example 710, it was stated that the block...Ch. 7 - Does the net work done on a particle depend on the...Ch. 7 - Prob. 2MCQ Ch. 7 - Prob. 3MCQ Ch. 7 - Prob. 5MCQ Ch. 7 - Prob. 7MCQ Ch. 7 - Prob. 8MCQ Ch. 7 - Prob. 9MCQ Ch. 7 - Prob. 10MCQ Ch. 7 - Prob. 12MCQ Ch. 7 - Prob. 13MCQ Ch. 7 - Prob. 14MCQ Ch. 7 - (I) How much work is done by the gravitational...Ch. 7 - (I) How high will a 1.85-kg rock go if thrown...Ch. 7 - (I) A 75.0-kg firefighter climbs a flight of...Ch. 7 - (I) A hammerhead with a mass of 2.0 kg is allowed...Ch. 7 - Prob. 5P Ch. 7 - Prob. 6P Ch. 7 - Prob. 7P Ch. 7 - Prob. 8P Ch. 7 - (II) Estimate the work you do to mow a lawn 10 m...Ch. 7 - Prob. 10P Ch. 7 - (II) A lever such as that shown in Fig. 720 can be...Ch. 7 - Prob. 12P Ch. 7 - Prob. 13P Ch. 7 - Prob. 14P Ch. 7 - Prob. 15P Ch. 7 - Prob. 16P Ch. 7 - Prob. 17P Ch. 7 - Prob. 18P Ch. 7 - (I) For any vector V=Vxi+Vyj+Vzk show that...Ch. 7 - Prob. 20P Ch. 7 - Prob. 21P Ch. 7 - Prob. 22P Ch. 7 - Prob. 23P Ch. 7 - (II) A constant force F=(2.0i+4.0j)N acts on an...Ch. 7 - Prob. 25P Ch. 7 - Prob. 26P Ch. 7 - (II) Show that if two nonparallel vectors have the...Ch. 7 - Prob. 28P Ch. 7 - Prob. 29P Ch. 7 - Prob. 30P Ch. 7 - Prob. 31P Ch. 7 - Prob. 32P Ch. 7 - Prob. 33P Ch. 7 - Prob. 34P Ch. 7 - Prob. 35P Ch. 7 - Prob. 36P Ch. 7 - Prob. 37P Ch. 7 - (II) If the hill in Example 72 (Fig. 74) was not...Ch. 7 - (II) The net force exerted on a particle acts in...Ch. 7 - Prob. 40P Ch. 7 - (II) The force on a particle, acting along the x...Ch. 7 - Prob. 42P Ch. 7 - Prob. 43P Ch. 7 - (II) At the top of a pole vault, and athlete...Ch. 7 - Prob. 45P Ch. 7 - Prob. 46P Ch. 7 - (II) If it requires 5.0 J of work to stretch a...Ch. 7 - (II) An object, moving along the circumference of...Ch. 7 - Prob. 49P Ch. 7 - Prob. 50P Ch. 7 - Prob. 51P Ch. 7 - Prob. 52P Ch. 7 - (III) A 3.0-m-long steel chain is stretched out...Ch. 7 - (I) At room temperature, an oxygen molecule, with...Ch. 7 - (I) (a) If the kinetic energy of a particle is...Ch. 7 - Prob. 56P Ch. 7 - Prob. 57P Ch. 7 - Prob. 58P Ch. 7 - Prob. 59P Ch. 7 - (II) An 85-g arrow is fired from a bow whose...Ch. 7 - (II) If the speed of a car is increased by 50%, by...Ch. 7 - Prob. 62P Ch. 7 - Prob. 63P Ch. 7 - Prob. 64P Ch. 7 - Prob. 65P Ch. 7 - (II) (a) How much work is done by the horizontal...Ch. 7 - Prob. 67P Ch. 7 - Prob. 68P Ch. 7 - (II) A train is moving along a track with constant...Ch. 7 - Prob. 70P Ch. 7 - Prob. 71P Ch. 7 - Prob. 72P Ch. 7 - Prob. 73P Ch. 7 - Prob. 74GP Ch. 7 - Prob. 75GP Ch. 7 - Prob. 76GP Ch. 7 - Prob. 77GP Ch. 7 - Prob. 78GP Ch. 7 - A varying force is given by F = Aekx, where x is...Ch. 7 - Prob. 80GP Ch. 7 - A force F=(10.0i+9.0j+12.0k)kNacts on a small...Ch. 7 - Prob. 82GP Ch. 7 - Prob. 83GP Ch. 7 - Prob. 84GP Ch. 7 - (III) We usually neglect the mass of a spring if...Ch. 7 - Prob. 86GP Ch. 7 - Prob. 87GP Ch. 7 - Prob. 88GP Ch. 7 - Prob. 89GP Ch. 7 - Prob. 90GP Ch. 7 - Prob. 91GP Ch. 7 - Assume a cyclist of weight mg can exert a force on...Ch. 7 - A car passenger buckles himself in with a seat...Ch. 7 - A simple pendulum consists of a small object of...Ch. 7 - Prob. 95GP Ch. 7 - A small mass m hangs at rest from a vertical rope...Ch. 7 - Prob. 97GP Ch. 7 - Prob. 98GP Ch. 7 - Stretchable ropes ate used to safely arrest the...Ch. 7 - Prob. 100GP

Additional Science Textbook Solutions

Find more solutions based on key concepts

Johnny was vigorously exercising the only joints in the skull that are freely movable. What would you guess he ...

Anatomy & Physiology (6th Edition)

9. What are the (a) amplitude and (b) frequency of the oscillation shown in Figure P14.9? Figure P14.9

College Physics: A Strategic Approach (3rd Edition)

Approximately how many feet is the Missouri River above sea level? Height above sea level: _________ feet

Applications and Investigations in Earth Science (9th Edition)

Heat lamps are commonly used to maintain foods at about 50C for as long as 12 hours in cafeteria serving lines....

Microbiology: An Introduction

a. Which compound has the stretching vibration for its carbonyl group at the highest frequency: acetyl chloride...

Organic Chemistry (8th Edition)

16. Explain some of the reasons why the human species has been able to expand in number and distribution to a g...

Campbell Biology: Concepts & Connections (9th 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.