A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass ‘
’ is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period
a)
Decreases continuously
b)
Decreases initially and increases again
c)
Remains unaltered
d)
Increases continuously
A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass ‘ ’ is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period
a)
Decreases continuously
b)
Decreases initially and increases again
c)
Remains unaltered
d)
Increases continuously
Question ID - 53136 | SaraNextGen Top Answer
A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass ‘ ’ is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period
a)
Decreases continuously
b)
Decreases initially and increases again
c)
Remains unaltered
d)
Increases continuously
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A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass ‘ |
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a) |
Decreases continuously |
b) |
Decreases initially and increases again |
c) |
Remains unaltered |
d) |
Increases continuously |
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(b) According to law of conservation of momentum
When viscous fluid of mass |
constant
is dropped and start spreading out then its moment of inertia increases and angular velocity decreases. But when it falls from the platform moment of inertia decreases so angular velocity increases again