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JEE Main Physics Class 11 Oscillations Part 1 Questions
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© examsnet.com
Question : 53
Total: 100
A pendulum with time period of
1
s
is losing energy. At certain time its energy is
45
J
.
If after completing 15 oscillations, its energy has become
15
J
,
its damping constant (in
s
−
1
) is :
[Online April 11, 2015]
1
2
1
30
ln
3
2
1
15
ln
3
Validate
Solution:
As we know,
E
=
E
0
e
−
b
t
m
15
=
45
e
−
b
15
m
[As no. of oscillations
=
15
so
t
=
15
s
e
c
]
1
3
=
e
−
b
15
m
Taking log on both sides
b
m
=
1
15
l
n
3
© examsnet.com
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