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Physics
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11 Dec 2019

What's the difference between the term "energy conservation" asused in this course and the way it is used in the media, such asnewspapers or television?

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Beverley Smith
Beverley SmithLv2
12 Dec 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

1. What conservation law does the loop law depend on?

2. What conservation law does the junction law depend on?

3. What is the difference between the EMF of a circuit and a potential difference in the circuit?

4. Determine the current being drawn from the 5-volt battery before the switch is closed, and the current drawn from the battery after it is closed. Why did it change in this way?

To practice Problem-Solving Strategy 21.1 Conservation of energy incharge interactions.

An alpha particle (), which is the same as a helium-4 nucleus, ismomentarily at rest in a region of space occupied by an electricfield. The particle then begins to move. Find the speed of thealpha particle after it has moved through a potential difference of-3.45×10-3 .
The charge and the mass of an alpha particle are = 3.20×10-19 and =6.68×10-27 , respectively.

PROBLEM-SOLVING STRATEGY Conservation of energy in chargeinteractions

PREPARE Draw a before-and-after visual overview. Define symbolsthat will be used in the problem, list known values, and identifywhat you're trying to find.

SOLVE The mathematical representation is based on the law ofconservation of mechanical energy:

.

Find the electric potential at both the initial and finalpositions. You may need to calculate it from a known expression forthe potential, such as that of a point charge.
and are the total kinetic energies of all moving particles.
Some problems may need additional conservation laws, such asconservation of charge or conservation of momentum.
ASSESS Check that your result has the correct units, is reasonable,and answers the question.

Prepare
Identify the system involving the alpha particle. Then examine theforces acting within this system to determine whether mechanicalenergy is conserved. Make certain to draw a before-and-after visualoverview and to define your symbols.
Part A
Mechanical energy is conserved in the presence of which of thefollowing types of forces?
Select all that apply.
? frictional
? electrostatic
? magnetic
? gravitational

Which of the following quantities are unknown?
? the value of the electric potential at the initial position ofthe alpha particle
? the final speed of the alpha particle
? the charge of the alpha particle
? the mass of the alpha particle
? the difference in potential between the initial and finalpositions of the alpha particle
? the value of the electric potential at the final position of thealpha particle
? the initial speed of the alpha particle

The power supplied to a typical black-and-white television set is96 W when the set is connected to 120 V.
(a) How much electrical energy does this set consume in 1hour?
J

(b) A color television set draws about 2.6 A when connected to 120V. How much time is required for it to consume the same energy asthe black-and-white model consumes in 1 hour?

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