Conceptual Integrated Science
3rd Edition
ISBN: 9780135197394
Author: Hewitt, Paul G., LYONS, Suzanne, (science Teacher), Suchocki, John, Yeh, Jennifer (jennifer Jean)
Publisher: PEARSON EDUCATION (COLLEGE)
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Textbook Question
Chapter 7, Problem 26RCQ
Why is iron magnetic and wood is not?
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4B. Four electrons are located on the corners of a square, one on each corner, with the sides of the square being 25 cm long. a) Draw a sketch of the scenario and use your sketch to b) Determine the total force (magnitude and direction) on one of the electrons from the other three?
Portfolio Problem 3. A ball is thrown vertically upwards with a speed vo
from the floor of a room of height h. It hits the ceiling and then returns to the
floor, from which it rebounds, managing just to hit the ceiling a second time.
Assume that the coefficient of restitution between the ball and the floor, e, is
equal to that between the ball and the ceiling. Compute e.
Portfolio Problem 4. Consider two identical springs, each with natural length
and spring constant k, attached to a horizontal frame at distance 2l apart. Their
free ends are attached to the same particle of mass m, which is hanging under
gravity. Let z denote the vertical displacement of the particle from the hori-
zontal frame, so that z < 0 when the particle is below the frame, as shown in
the figure. The particle has zero horizontal velocity, so that the motion is one
dimensional along z.
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(a) Show that the total force acting on the particle is
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(b) Find the potential energy U(x, y, z) of the system such that U
x = : 0.
= O when
(c) The particle is pulled down until the springs are each of length 3l, and then
released. Find the velocity of the particle when it crosses z = 0.
Chapter 7 Solutions
Conceptual Integrated Science
Ch. 7 - Which part of an atom is positively charged, and...Ch. 7 - What is meant by saying that charge is conserved?Ch. 7 - How is Coulombs law similar to Newtons law of...Ch. 7 - How does a coulomb of charge compare with the...Ch. 7 - Give two examples of common force fields.Ch. 7 - How is the direction of an electric field defined?Ch. 7 - In terms of the units that measure them,...Ch. 7 - A balloon may easily be charged to several...Ch. 7 - What is the difference between a conductor and an...Ch. 7 - What kinds of material are the best conductors?...
Ch. 7 - What condition is necessary for heat energy to...Ch. 7 - What condition is necessary for a sustained flow...Ch. 7 - Why do electrons, rather than protons, make up the...Ch. 7 - Distinguish between DC and AC.Ch. 7 - Which has more resistancea thick wire or a thin...Ch. 7 - What is the unit of electrical resistance?Ch. 7 - What is the effect on the current through a...Ch. 7 - How much current does a radio speaker with a...Ch. 7 - Which type of circuit is favored for operating...Ch. 7 - How does the sum of the currents through the...Ch. 7 - What is the relationship among electric power,...Ch. 7 - Considering a kilowatt and a kilowatt-hour, which...Ch. 7 - Prob. 23RCQCh. 7 - Prob. 24RCQCh. 7 - Prob. 25RCQCh. 7 - Why is iron magnetic and wood is not?Ch. 7 - Prob. 27RCQCh. 7 - What is a galvanometer? What is it called when it...Ch. 7 - What are the three ways in which voltage can be...Ch. 7 - a What is induced by the rapid alternation of a...Ch. 7 - High voltage by itself does not produce electric...Ch. 7 - What is the source of the electrons that shock you...Ch. 7 - If a current of 0.1 or 0.2 of an ampere were to...Ch. 7 - What effect does high temperature have on a common...Ch. 7 - Electric charges at rest produce an electric...Ch. 7 - People have wondered about the "mystery" of animal...Ch. 7 - What is the likely cause of Earths magnetic field?Ch. 7 - Two point charges, each with 0.1C of charge, are...Ch. 7 - A toaster has a heating element of 15 and is...Ch. 7 - When you touch your fingers resistance 1000 to the...Ch. 7 - Calculate the current in the 240 filament of a...Ch. 7 - An electric toy draws 0.5A from a 120-V outlet....Ch. 7 - Show that the power consumed by a 120-V device...Ch. 7 - The three pairs of same-size metal spheres have...Ch. 7 - Rank circuits A, B, and C according to the...Ch. 7 - The bulbs in parallel circuits A, B, and C are...Ch. 7 - Bar magnets are moved into the wire coils in...Ch. 7 - Two point charges are separated by 6cm. The...Ch. 7 - A droplet of ink in an industrial ink-jet printer...Ch. 7 - Find the voltage change a when an electric field...Ch. 7 - Rearrange this equation Current=voltageresistance...Ch. 7 - Use the formula Power=currentvoltage to find that...Ch. 7 - Show that it costs 3.36 to operate a 100-W lamp...Ch. 7 - An electric iron connected to 120V draws 9A of...Ch. 7 - When combing your hair, you scuff electrons from...Ch. 7 - The 5000 billion billion freely moving electrons...Ch. 7 - What is meant by saying that charge is conserved?Ch. 7 - Two equal charges exert equal forces on each...Ch. 7 - How does the strength of electric force between a...Ch. 7 - In what way does an electrically polarized object...Ch. 7 - A particle having a charge qcoulombs experiences a...Ch. 7 - Suppose that the strength of the electric field...Ch. 7 - What is the term given to the electric potential...Ch. 7 - Why might the wingspans of birds be a...Ch. 7 - Why is a good conductor of electricity also a good...Ch. 7 - A garden hose waters a garden. Water in a car...Ch. 7 - A hydraulic pump doesnt produce water but,...Ch. 7 - Lillian is charged to some 50,000V but is...Ch. 7 - Batteries and generators produce electric current....Ch. 7 - Which travels at nearly the speed of light in an...Ch. 7 - Which flows through an electric circuit: voltage,...Ch. 7 - Comment on the warning sign in the sketch.Ch. 7 - Which has the greater electric resistance: a wire...Ch. 7 - What is the effect on the current in a wire if the...Ch. 7 - Why can a bird safely perch on an un insulated...Ch. 7 - If a bird perched on a high-voltage wire reaches...Ch. 7 - Will the current in a light bulb connected to a...Ch. 7 - In Figure 7.24, Will uses four batteries to light...Ch. 7 - In Figure 7.25, author Paul lights three identical...Ch. 7 - As more and more bulbs are connected in a series...Ch. 7 - In the circuit shown, how does the brightness of...Ch. 7 - What unit of measurement is meant by a joule per...Ch. 7 - What happens to the brightness in a lamp of any...Ch. 7 - Why are LED bulbs more efficient than incandescent...Ch. 7 - Electric charge may be positive or negative but...Ch. 7 - Surrounding any mass is a gravitational field....Ch. 7 - In what sense is motion relevant to a magnetic...Ch. 7 - Since every iron atom is a tiny magnet, why aren't...Ch. 7 - In what relative direction between a magnetic...Ch. 7 - Prob. 97TECh. 7 - Is it correct to say that an electric motor is a...Ch. 7 - In what way did Maxwell add to the physics of...Ch. 7 - How does electromagnetic induction lead to the...Ch. 7 - When a car is moved into a painting chamber, a...Ch. 7 - You are not harmed by contact with a charged Van...Ch. 7 - Discuss the circuits shown. In which of these...Ch. 7 - Sometimes you hear someone say that a particular...Ch. 7 - Are automobile headlights wired in parallel or in...Ch. 7 - Your tutor tells you that an ampere and a volt...Ch. 7 - The circuit shown in an incandescent flashlight...Ch. 7 - A person in your discussion group says that...Ch. 7 - Another person in your discussion group says that...Ch. 7 - Still another person in your discussion group says...Ch. 7 - Can an electron at rest in a magnetic field be set...Ch. 7 - A magician places an aluminum ring on a table,...Ch. 7 - An electron and a proton a attract each other. b...Ch. 7 - When a pair of charged particles are brought twice...Ch. 7 - Surrounding every moving electron is a an electric...Ch. 7 - When you double the voltage in a simple electric...Ch. 7 - In a simple circuit consisting of a single lamp...Ch. 7 - In a circuit with two lamps in parallel if the...Ch. 7 - If both current and the voltage in a circuit are...Ch. 7 - The essential physics concept in an electric...Ch. 7 - Prob. 9RATCh. 7 - The mutual induction of electric and magnetic...
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