Last Updated On 01-06-2023 - By Jeesha Sara
A disc is freely rotating with an angular speed 
on a smooth horizontal plane. If it is hooked at a rigid page 
and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to
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a) |
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b) |
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c) |
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d) |
None of these |
Question ID - 100220 :- A disc is freely rotating with an angular speed on a smooth horizontal plane. If it is hooked at a rigid page and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to
a)
b)
c)
d)
None of these
A disc is freely rotating with an angular speed on a smooth horizontal plane. If it is hooked at a rigid page and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to
|
a) |
|
b) |
|
c) |
|
d) |
None of these |
(b)
During the impact, the forces pass through point 
. Therefore, the torque produced by it about 
is equal to zero
.png)
Consequently, the angular momentum of the disc about 
, just before and after the impact, remains the same
…(i)
Where 
angular momentum of the disc about 
just before the impact
angular momentum of the disc about 
just after the impact
Just before the impact, the disc rotates about 
. But just after the impact, the disc rotates about 
Next Question :
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A stationary body of mass 3 kg explodes into three equal pieces. Two of the pieces fly off at right angles to each other. One with a velocity of 2 |
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a) |
( |
b) |
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c) |
( |
d) |
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m/s and the other with a velocity of 3
m/s.If the explosion takes place in 
s, the average force acting on the third piece in newtons is
)
)
)
) 
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