Pearson eText Conceptual Physical Science -- Instant Access (Pearson+)

6th Edition

ISBN: 9780134857107

Author: Paul Hewitt, John Suchocki

Publisher: PEARSON+

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Textbook Question

Chapter 9, Problem 78E

Does a cyclist coast farther if the headlamp connected the bike generator is turned off? Explain.

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Chapter 9, Problem 77E

Chapter 9, Problem 79E

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5.77 A block with mass m₁ is placed on an inclined plane with slope angle a and is connected to a hanging block with mass m₂ by a cord passing over a small, frictionless pulley (Fig. P5.74). The coef- ficient of static friction is μs, and the coefficient of kinetic friction is Mk. (a) Find the value of m₂ for which the block of mass m₁ moves up the plane at constant speed once it is set in motion. (b) Find the value of m2 for which the block of mass m₁ moves down the plane at constant speed once it is set in motion. (c) For what range of values of m₂ will the blocks remain at rest if they are released from rest?

5.78 .. DATA BIO The Flying Leap of a Flea. High-speed motion pictures (3500 frames/second) of a jumping 210 μg flea yielded the data to plot the flea's acceleration as a function of time, as shown in Fig. P5.78. (See "The Flying Leap of the Flea," by M. Rothschild et al., Scientific American, November 1973.) This flea was about 2 mm long and jumped at a nearly vertical takeoff angle. Using the graph, (a) find the initial net external force on the flea. How does it compare to the flea's weight? (b) Find the maximum net external force on this jump- ing flea. When does this maximum force occur? (c) Use the graph to find the flea's maximum speed. Figure P5.78 150 a/g 100 50 1.0 1.5 0.5 Time (ms)

5.4 ⚫ BIO Injuries to the Spinal Column. In the treatment of spine injuries, it is often necessary to provide tension along the spi- nal column to stretch the backbone. One device for doing this is the Stryker frame (Fig. E5.4a, next page). A weight W is attached to the patient (sometimes around a neck collar, Fig. E5.4b), and fric- tion between the person's body and the bed prevents sliding. (a) If the coefficient of static friction between a 78.5 kg patient's body and the bed is 0.75, what is the maximum traction force along the spi- nal column that W can provide without causing the patient to slide? (b) Under the conditions of maximum traction, what is the tension in each cable attached to the neck collar? Figure E5.4 (a) (b) W 65° 65°

Chapter 9 Solutions

Pearson eText Conceptual Physical Science -- Instant Access (Pearson+)

Ch. 9 - How does the range of refrigerator magnets differ...Ch. 9 - Prob. 2RCQ Ch. 9 - Prob. 3RCQ Ch. 9 - Prob. 4RCQ Ch. 9 - What two kinds of motion are exhibited by...Ch. 9 - What is a magnetic domain?Ch. 9 - Why is iron magnetic and wood not magnetic?.Ch. 9 - Prob. 8RCQ Ch. 9 - What happens to the direction of the magnetic...Ch. 9 - Why is the magnetic field strength inside a...

Ch. 9 - How is the strength of the magnetic field in a...Ch. 9 - In what direction relative to a magnetic field...Ch. 9 - What effect does Earths magnetic field have on the...Ch. 9 - What relative direction between a magnetic field...Ch. 9 - Prob. 15RCQ Ch. 9 - What is a galvanometer called when it is...Ch. 9 - Is it correct to say that an electric motor is a...Ch. 9 - What important discovery did physicists Michael...Ch. 9 - State Faradays law.Ch. 9 - What are the three ways in which voltage can be...Ch. 9 - How does the frequency of induced voltage compare...Ch. 9 - What are the basic differences and similarities...Ch. 9 - Is the current that is produced by a common...Ch. 9 - What commonly supplies the energy input to a...Ch. 9 - Is it correct to say that a generator produces...Ch. 9 - Is it correct to say that a transformer boosts...Ch. 9 - Which of these does a transformer change: voltage,...Ch. 9 - What is induced by the rapid alternation of a...Ch. 9 - What is induced by the rapid alternation of an...Ch. 9 - What important connection did Maxwell discover...Ch. 9 - PLUG AND CHUG (FORMULA FAMILIARIZATION)...Ch. 9 - PLUG AND CHUG (FORMULA FAMILIARIZATION)...Ch. 9 - A video game console requires 6 V to operate...Ch. 9 - A model electric train requires 6 V to operate....Ch. 9 - A transformer for a laptop computer converts a...Ch. 9 - Show that if the output current for the...Ch. 9 - A transformer has an input of 6 V and an output of...Ch. 9 - An ideal transformer has 50 turns in its primary...Ch. 9 - Neon signs require about 12,000 Y for their...Ch. 9 - A power of 100 kW (105W) is delivered to the other...Ch. 9 - Bar magnets are moved into the wire coils in...Ch. 9 - Each of the transformers shown below powered with...Ch. 9 - Many dry cereals are fortified with iron, which is...Ch. 9 - If you place a chunk of iron near the north pole...Ch. 9 - How do the magnetic poles of refrigerator magnets...Ch. 9 - Prob. 50E Ch. 9 - What kind of force field surrounds a stationary...Ch. 9 - Prob. 52E Ch. 9 - All atoms have moving electric charges. Why, they...Ch. 9 - Will either pole of a magnet attract a paper clip?...Ch. 9 - A friend tells you that aluminum lies beneath the...Ch. 9 - Magnet A has twice the magnetic field strength of...Ch. 9 - Prob. 57E Ch. 9 - To make a compass point an ordinary iron nail...Ch. 9 - Nails sticking to a magnet is understandable. But...Ch. 9 - When steel naval ships are built, the location of...Ch. 9 - How do force field lines for gravitation about a...Ch. 9 - Can an electron at rest in a magnetic field be set...Ch. 9 - When a current-carrying wire is placed in a strong...Ch. 9 - Two charged particles are projected into a...Ch. 9 - In Figure 9.17, we see a magnet exerting a force...Ch. 9 - Residents of northern Canada are bombarded by more...Ch. 9 - When doing spacewalks, why do astronauts keep to...Ch. 9 - What changes in cosmic-ray intensity at Earths...Ch. 9 - Prob. 69E Ch. 9 - Historically, replacing dirt roads with paved...Ch. 9 - A common pickup for on electric guitar consists of...Ch. 9 - When Tim pushes the wire between the poles of the...Ch. 9 - At the airport security area you walk through a...Ch. 9 - If your metal car moves over a wide, closed loop...Ch. 9 - Two separate but similar coils of wire are mounted...Ch. 9 - Why will more voltage be induced with the...Ch. 9 - Why is a generator armature harder to rotate when...Ch. 9 - Does a cyclist coast farther if the headlamp...Ch. 9 - How do the input and output parts of a generator...Ch. 9 - Your friend says that if you crank the shaft of a...Ch. 9 - Correct the statement that a generator produces...Ch. 9 - Discuss what is wrong with the following scheme:...Ch. 9 - What is wrong with the statement that a very...Ch. 9 - Why will a transformer not work in a dc circuit?Ch. 9 - What is the principal difference between a step-up...Ch. 9 - In what sense can a transformer be viewed as an...Ch. 9 - Can an efficient transformer step up energy?...Ch. 9 - A friend says that changing electric and magnetic...Ch. 9 - Would electromagnetic waves exist if changing...Ch. 9 - Your physics instructor drops a magnet through a...Ch. 9 - This exercise is similar to the previous one. Why...Ch. 9 - Discuss why a motor also tends to act as a...Ch. 9 - Both the English physicist Michael Faraday and the...Ch. 9 - One method for making a compass is to stick a...Ch. 9 - Your lab partner says, An electron always...Ch. 9 - In a mass spectrometer, ions are directed into a...Ch. 9 - A cyclotron is a device for accelerating charged...Ch. 9 - A beam of high-energy protons emerges from a...Ch. 9 - A magnetic field can deflect a beam of electrons,...Ch. 9 - When Fred Cauthen releases the sheet of copper,...Ch. 9 - A piece of plastic tape coated with iron oxide is...Ch. 9 - If you place a metal ring in a region where a...Ch. 9 - How could a light bulb near an electromagnet, but...Ch. 9 - Why can a hum usually be heard when a transformer...Ch. 9 - Prob. 105DQ Ch. 9 - A magician places an aluminum ring on a table,...Ch. 9 - Do a pair of parallel current-carrying wires exert...Ch. 9 - Choose the BEST way to complete the statement. 1....Ch. 9 - Surrounding moving electric charges are (a)...Ch. 9 - Prob. 3RAT Ch. 9 - A magnetic force acting on a beam of electrons can...Ch. 9 - When you move a bar magnet to and fro, first...Ch. 9 - The principle underlying the operation of an...Ch. 9 - The essential physics concept in the operation of...Ch. 9 - A transformer works in accordance with (a)...Ch. 9 - A step-up transformer in an electric circuit can...Ch. 9 - Prob. 10RAT

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