Home
Class 12
PHYSICS
A circular disc of moment of inertia I(t...

A circular disc of moment of inertia `I_(t)` is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed `omega_(i)`. Another disc of moment of inertia `I_(b)` is dropped coaxially onto the rotating disc. Initially the second disk has zero angular speed. eventually both the disc rotate with a constant angular speed `omega_(f)`. The energy lost by initially rotating disc due to friction is

A

`(1)/(2)(l_(b)^(2))/((l_(t)+l_(b)))omega_(1)^(2)`

B

`(1)/(2)(l_(t)^(2))/((l_(t)+l_(b)))omega_(1)^(2)`

C

`(l_(b)-l_(t))/((l_(t)+l_(b)))omega_(1)^(2)`

D

`(1)/(2)(l_(b)-l_(t))/((l_(t)+l_(b)))omega_(1)^(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

A circular disc of moment of inertia I_(t) is rotating in a horizontal plane about its symmetry axis with a constant angular velocity omega_(i) . Another disc of moment of inertia I_(b) is dropped co-axially onto the rotating disc. Initially, the second disc has zero angular speed. Eventually, both the discs rotate with a constant angular speed omega_(f) . Calculate the energy lost by the initially rotating disc due to friction.

A disc of the moment of inertia 'l_(1)' is rotating in horizontal plane about an axis passing through a centre and perpendicular to its plane with constant angular speed 'omega_(1)' . Another disc of moment of inertia 'I_(2)' . having zero angular speed is placed discs are rotating disc. Now, both the discs are rotating with constant angular speed 'omega_(2)' . The energy lost by the initial rotating disc is

If a person standing on a rotating disc stretches out his hands, the angular speed will

A thin uniform circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with an angular velocity omega . Another disc of same dimensions but of mass (1)/(4) M is placed gently on the first disc co-axially. The angular velocity of the system is

A circular disc of mass M and radius R is rotating about its axis with angular speed If about another stationary disc having radius omega_1 . R/2 and same mass M is dropped co- axially on to the rotating disc. Gradually both discs attain constant angular speed omega_2 . The energy lost in the process is p% of the initial energy . Value of p is ........

A round disc of moment of inertia I_2 about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I_1 rotating with an angular velocity omega about the same axis. The final angular velocity of the combination of discs is.

Two discs of moments of inertia I_(1) and I_(2) about their respective axes (normal to the disc and passing through the centre), and rotating with angular speed omega_(1) and omega_(2) are brought into contact face to face with their axes of rotation coincident . What is the angular speed of the two-disc system ?

A disc with moment of inertia I is rotating with some angular speed. Second disc is initially at rest. Now second disc with moment of inertia 3I is placed on first disc and starts rotating. Find loss of kinetic energy in fraction

A disc with moment of inertial I is rotating with some angular speed. Second disc is initially at rest. Now second disc with moment of inertia 3I is placed on first disc and starts rotating. Find loss of kinetic energy in fraction

The moment of inertia of a copper disc, rotating about an axis passing through its centre and perpendicular to its plane