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MHT CET 2020 Physics Solved Paper
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© examsnet.com
Question : 41
Total: 50
A mass
m
is revolving in a vertical circle at the end of a string of length
20
c
m
. By how much does the tension of the string at the lowest point exceed the tension at the topmost point?
2
m
g
4
m
g
6
m
g
8
m
g
Validate
Solution:
The tension
T
1
at the topmost point is given by
T
1
=
m
v
1
2
20
−
m
g
Centrifugal force acting outward while weight acting downward. The tension
T
2
at the lowest point
T
2
=
m
v
2
2
20
+
m
g
Centrifugal force and weight (both) acting downward
T
2
−
T
1
=
m
v
2
2
−
m
v
1
2
20
+
2
m
g
v
1
2
=
v
2
2
−
2
g
h
or
v
2
2
−
v
1
2
=
2
g
(
40
)
=
80
g
∴
T
2
−
T
1
=
80
m
g
20
+
2
m
g
=
6
m
g
© examsnet.com
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