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) |
|
c) |
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d) |
None of these |
Question ID - 100220 | SaraNextGen Answer 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 
