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JEE Mains Model Paper 13
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© examsnet.com
Question : 7
Total: 90
The blocks shown are in equilibrium. A bullet of mass m moving horizontally with
√
2
g
l
speed hits the hanging block and gets embedded in it. Find the minimum coefficient offriction μ between the block (M) and rough surface so that it remains at equilibrium
2/3
3/2
1
5/2
Validate
Solution:
After hitting the block, the bullet gets embedded and hence the lower block starts movingin a vertical circle with speed (v) at the lower- most point
v =
√
2
g
l
2
T
max
= 2mg + 2m
V
2
I
= µ mg = 3mg = µ × 2mg
µ = 3/2
© examsnet.com
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