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AP EAMCET Engineering 2011 Solved Paper
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© examsnet.com
Question : 17
Total: 160
Two blocks of masses
1
k
g
and
2
k
g
are connected by a metal wire going over a smooth pulley. The breaking stress of metal is
40
3
π
×
10
6
N
m
−
2
. What should be the minimum radius of wire used if it should not break?
(
g
=
10
m
s
−
2
)
0.5
m
m
1
m
m
1.5
m
m
2
m
m
Validate
Solution:
Breaking stress
=
F
A
Here, breaking stress
=
40
3
π
×
10
6
N
m
−
2
⇒
40
3
π
×
10
6
=
3
×
10
π
r
2
⇒
r
2
=
9
4
×
10
−
6
or
r
=
1.5
×
10
−
3
m
=
1.5
m
m
© examsnet.com
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