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AP EAMCET Engineering 2011 Solved Paper
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© examsnet.com
Question : 8
Total: 160
A 1 N pendulum bob is held at an angle
θ
from the vertical by a
2
N
horizontal force
F
as shown in the figure. The tension in the string supporting the pendulum bob (in newton) is
cos
θ
2
cos
θ
√
5
1
Validate
Solution:
As the bob is in equilibrium under the effect of three forces
−
T
,
F
and
W
∴
T
+
P
+
W
=
0
From, the figure
T
cos
θ
=
W
.....(i)
T
sin
θ
=
F
.......(ii)
From Eqs. (i) and (ii)
T
2
=
W
2
+
F
2
or
T
=
√
W
2
+
F
2
=
√
(
1
)
2
+
(
2
)
2
=
√
5
© examsnet.com
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