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
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