Modern Physics
3rd Edition
ISBN: 9781111794378
Author: Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher: Cengage Learning
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Question
Chapter 16, Problem 14P
(a)
To determine
Self-energy of the milky way of the galaxy.
(c)
To determine
The self-energy of the Sun.
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Problem
A moving electron has a Kinetic Energy K1. After a net amount of work is done on it, the electron is moving one-quarter as fast in the opposite direction. What is the work done
W in terms of Kq?
Solution
To solve for the work done, first we must determine what is the final kinetic energy of the electron.
By concept, we know that
K1=(1/2)mv²,
K2=(1/2)mv2
But it was mentioned that:
so, Kz in terms of v is
K2=(
)mv²1
Substituting the expression for K1 results to
K2=(
Since work done is
W=AK=K
-K
Evaluating results to
W=(
)K1
Problem
A moving electron has a Kinetic Energy K1. After a net amount of work is done on it, the electron is moving one-quarter as fast in the opposite direction. What is the work done W
in terms of K1?
Solution
To solve for the work done, first we must determine what is the final kinetic energy of the electron.
By concept, we know that
K1=(1/2)mv²,
K2=(1/2)mv2
But it was mentioned that:
v2=(
V1
so, K2 in terms of v1 is
K2=(
mv²,
Substituting the expression for K1 results to
K2=(
)K1
Since work done is
W=AK=K
-K
Evaluating results to
W=(
)K1
Problem
A moving electron has a Kinetic Energy K1. After a net amount of work is done on it, the electron is moving one-quarter as fast in the opposite direction. What is the work done Win terms of K1?
Solution
To solve for the work done, first we must determine what is the final kinetic energy of the electron.
By concept, we know that
K1=(1/2)mv²1
K2=(1/2)my2
But it was mentioned that:
v2=(
v1
so, K2 in terms of v1 is
K2=(
)mv²,
Substituting the expression for K1 results to
K2=(
Since work done is
W=AK=K
-K
Evaluating results to
W=(
K1
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