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KEAM 2020 Physics and Chemistry Solved Paper
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© examsnet.com
Question : 4
Total: 120
If a ring rolls down from top to bottom of an inclined plane, it takes time
t
1
.
If it slides, it takes time
t
2
.
Then the ratio
t
2
2
t
1
2
is
1
3
2
3
1
4
1
2
2
5
Validate
Solution:
t
1
→
Rolling
t
2
→
sliding
a
roll
=
g
sin
θ
1
+
k
2
R
2
a
slide
=
g
⋅
sin
θ
t
1
=
√
2
s
a
=
√
2
s
(
1
+
k
2
R
2
)
g
sin
θ
t
2
=
√
2
s
g
sin
θ
t
2
2
t
1
2
=
1
1
+
k
2
R
2
=
1
1
+
1
=
1
2
© examsnet.com
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