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NEET 2016 Physics and Chemistry Paper 1
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© examsnet.com
Question : 23
Total: 90
A uniform circular disc of radius
50
cm at rest is free to turn about an axis which is perpendicular to its plane and passes through its centre. it is subjected to a torque which produces a constant angular acceleration of
2.0
rad
s
−
2
. Its net acceleration in
m
s
−
2
at the end of 2.0 s is approximately :
[NEET 2016 P1]
3.0
8.0
7.0
6.0
Validate
Solution:
👈: Video Solution
The angular speed of disc increases with time, and hence centripetal acceleration
also
a
n
e
t
=
√
a
1
2
+
a
c
2
υ= tangential speed
R = Radius
=
0.5
m
V
=
2
m
s
at
t
=
2
⇒
a
c
=
8
m
s
;
a
t
=
R
α
=
(
0.5
)
(
2
)
⇒
a
n
e
t
=
√
8
2
+
1
2
≃
8
© examsnet.com
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