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homework 33 – NOORANI, ZOHEB
1
Latest unpenalized work: Apr 18 2008 Friday
04:00 (after this date you can not make a
perfect score).
Work cuto±: Apr 19 2008,
4:00 am.
Question 1, chap 16, sect 2.
part 1 of 2
10 points
A steel piano wire is 0
.
7 m long and has a
mass of 80 g. It is stretched with a tension of
100 N.
What is the speed of transverse waves on
the wire?
Answer in units of m
/
s.
Question 2, chap 16, sect 2.
part 2 of 2
10 points
To reduce the wave speed by a factor of 2
without changing the tension, what mass of
copper wire would have to be wrapped around
the steel wire?
Answer in units of g.
Question 3, chap 16, sect 2.
part 1 of 1
10 points
Tension is maintained in a string as in the
²gure. The observed wave speed is 28 m
/
s
when the suspended mass is 3
.
5 kg
.
The acceleration of gravity is 9
.
8 m
/
s
2
.
3
.
5 kg
What is the wave speed when the suspended
mass is 2 kg?
Answer in units of m
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 Spring '08
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