Conceptual Physical Science (6th Edition)
6th Edition
ISBN: 9780134060491
Author: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 72E
Why are objects with vast numbers of electrons normally not electrically charged?
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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 8 Solutions
Conceptual Physical Science (6th Edition)
Ch. 8 - Which part of an atom is positively charged, anti...Ch. 8 - How does the charge of one electron compare with...Ch. 8 - How do the masses of electrons compare with the...Ch. 8 - Prob. 4RCQCh. 8 - What kind of charge does an object acquire when...Ch. 8 - What is meant by saying that charge is conserved?Ch. 8 - How is Coulomb's law similar to Newton's law of...Ch. 8 - How does a coulomb of charge compare with the...Ch. 8 - How does the magnitude of electrical force between...Ch. 8 - How does an electrically polarized object differ...
Ch. 8 - Give two examples of common force fields.Ch. 8 - How is the direction of an electric field defined?Ch. 8 - In terms of the units that measure them,...Ch. 8 - A balloon may easily be charged to several...Ch. 8 - What condition is necessary for a sustained flow...Ch. 8 - How much energy is given to each coulomb of charge...Ch. 8 - Does electric charge flow across a circuit or...Ch. 8 - Distinguish between dc and ac.Ch. 8 - Does a battery produce dc or ac? Does the...Ch. 8 - Which has the greater resistance, a thick wire or...Ch. 8 - What is the unit of electrical resistance?Ch. 8 - What is the effect on current through a circuit of...Ch. 8 - Which has the greater electrical resistance, wet...Ch. 8 - What is the function of the third prong on the...Ch. 8 - What is the source of electrons that produces a...Ch. 8 - In a circuit consisting of two lamps connected in...Ch. 8 - If 6 V were impressed across the circuit in...Ch. 8 - How does the total current through the branches of...Ch. 8 - As more lanes are opened at a fast-food...Ch. 8 - What is the relationship among electric power,...Ch. 8 - Coulombs Law: F=kq1q2d2 35. Two point charges,...Ch. 8 - A toaster has a heating element of 15 and is...Ch. 8 - Show that when you touch your wet fingers...Ch. 8 - Calculate the current in the 240- filament of a...Ch. 8 - An electric toy draw 0.5 A from a 120-V outlet....Ch. 8 - Calculate the power of a hair dryer that operates...Ch. 8 - Two pellets, each with a charge of 1 microcoulomb...Ch. 8 - Two point changes are separated by 4 cm. The...Ch. 8 - Show that if the charges attracting each other in...Ch. 8 - A droplet of ink in an industrial ink-jet printer...Ch. 8 - A 12-V battery moves 4 C of charge from one...Ch. 8 - Suppose you could expend 10 joules of work to push...Ch. 8 - The potential difference between a storm cloud and...Ch. 8 - The power in watts marked on a light bulb is not...Ch. 8 - Rearrange the formula Current = voltage/resistance...Ch. 8 - Using the formula Power = current voltage, show...Ch. 8 - A dehumidifier with a resistance of 20 draws 6.0...Ch. 8 - An electric space heater dissipates 1320 W of...Ch. 8 - The total charge that an automobile battery can...Ch. 8 - Show that it costs 7 cents to operate a 25-W porch...Ch. 8 - Suppose you operate a 100-W lamp continuously for...Ch. 8 - An electric dryer connected to a 120-V source...Ch. 8 - For the electric dryer of the previous problem,...Ch. 8 - An incandescent light bulb with an operating...Ch. 8 - In periods of peak demand, power companies lower...Ch. 8 - The three pairs of same-size metal spheres have...Ch. 8 - Rank, from brightest to dimmest, the identical...Ch. 8 - The bulbs are identical. Ammeters are placed in...Ch. 8 - All bulbs, are identical in the circuits. An...Ch. 8 - All bulbs are identical in the circuits. A...Ch. 8 - Consider the three parts of the circuit. First...Ch. 8 - At the atomic level, what is meant by saying...Ch. 8 - Why is charge usually transferred by electrons...Ch. 8 - Why are objects with vast numbers of electrons...Ch. 8 - If you scuff electrons from your shoes while...Ch. 8 - Why do clothes often cling together after tumbling...Ch. 8 - An electroscope is a simple device consisting of a...Ch. 8 - The leaves of a changed electroscope collapse in...Ch. 8 - If electrons were positive and protons were...Ch. 8 - When you double the distance between a pair of...Ch. 8 - When you double the charge on only one of a pair...Ch. 8 - When you double the charge on both particles in a...Ch. 8 - If you rub an inflated balloon against your hair...Ch. 8 - If you rub an inflated balloon against your hair...Ch. 8 - When a car is moved into a painting chamber, a...Ch. 8 - By what specific means do the bits of fine threads...Ch. 8 - Suppose that the strength of the electric field...Ch. 8 - Suppose an investigator places first a free...Ch. 8 - Why is voltage often referred to as an electric...Ch. 8 - Why might the wingspans of birds be a...Ch. 8 - One example of a water system is a garden hose...Ch. 8 - How is a hydraulic pump that produces sustained...Ch. 8 - What is the difference between electric potential...Ch. 8 - Why is a good conductor of electricity also a good...Ch. 8 - Which travels at nearly the speed of light in an...Ch. 8 - Which flows through an electric circuit: voltage,...Ch. 8 - Would you expect to find dc or ac in the filament...Ch. 8 - Comment on the warning sign in the sketch.Ch. 8 - Which has the higher resistance: a lamp filament...Ch. 8 - Only a small percentage of the electric energy...Ch. 8 - What is the effect on the current in a wire if...Ch. 8 - Why is a bird perched on a high-voltage wire safe,...Ch. 8 - Say the bird perched on a high-voltage wire...Ch. 8 - What does it mean to say that an electric...Ch. 8 - If a current of one- or two-tenths of an ampere...Ch. 8 - Consider a water pipe that branches into two...Ch. 8 - Consider a circuit with a main wire that branches...Ch. 8 - Are automobile headlights wired in parallel or in...Ch. 8 - As more lanes are added to toll booths, the...Ch. 8 - (a) Which is the same for a 10- and a 20- resistor...Ch. 8 - If several bulbs are connected in series to a...Ch. 8 - Which is less damaging: plugging a 110-V appliance...Ch. 8 - What unit of measurement is meant by (a) joule per...Ch. 8 - What happens to the brightness of light emitted by...Ch. 8 - Why are LED lamps more efficient than incandescent...Ch. 8 - Is it correct to say that the energy from a car...Ch. 8 - A cars headlight dissipates 40 W on low beam and...Ch. 8 - The proportionality constant k in Coulombs law is...Ch. 8 - A friend says that the reason ones hair stands out...Ch. 8 - Your tutor tells you that an ampere and a volt...Ch. 8 - The circuit within an incandescent bulb is shown...Ch. 8 - In which of the following circuits does a current...Ch. 8 - Does more current "flow" out of a battery than...Ch. 8 - Sometimes you hear someone say that a particular...Ch. 8 - Does a lamp with a thick filament draw more...Ch. 8 - Is the current in a light bulb connected to a...Ch. 8 - Is the following label on a household product...Ch. 8 - The equivalent resistance of a pair of resistors...Ch. 8 - A friend says that a battery provides not a source...Ch. 8 - A friend says that adding bulbs in series to a...Ch. 8 - Consider a pair of flashlight bulbs connected to a...Ch. 8 - In the circuit shown, how do the three identical...Ch. 8 - As more and more bulbs are connected in series to...Ch. 8 - A battery has internal resistance, so when the...Ch. 8 - Are these circuits equivalent to one another? Why...Ch. 8 - Your friend says that electric current takes the...Ch. 8 - Consider a pair of incandescent bulbs, a 60-W bulb...Ch. 8 - Choose the BEST answer to the question or the BEST...Ch. 8 - When a pair of charged particles are brought twice...Ch. 8 - An electric field surrounds all (a) electrons. (b)...Ch. 8 - Electric potential and electric potential energy...Ch. 8 - Which statement(s) is(are) correct? (a) Voltage...Ch. 8 - When you double the voltage in a simple electric...Ch. 8 - When you double both the current and the voltage...Ch. 8 - In a simple circuit consisting of a single lamp...Ch. 8 - In a circuit with two lamps in parallel, if the...Ch. 8 - What is the power rating of a lamp connected to a...
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