EBK PHYSICS
5th Edition
ISBN: 9780134051796
Author: Walker
Publisher: YUZU
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Question
Chapter 29, Problem 62PCE
To determine
The work required to completely disassemble a helium atom.
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How much work is required to stop an electron (m=9.11×10−31kg)(m=9.11×10−31kg) which is moving with a speed of 1.90×106 m/s ?
Express your answer to three significant figures and include the appropriate units.
What's this?
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)mv21
K2=(1/2)mv2
But it was mentioned that:
v2=(
V1
so, K2 in terms of v1 is
K2=(
mv²1
Substituting the expression for K1 results to
K2=(
K1
Since work done is
W=AK=K
-K
Evaluating results to
W=(
K1
Chapter 29 Solutions
EBK PHYSICS
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