Home
Class 12
PHYSICS
A disc is rotating with angular velocity...

A disc is rotating with angular velocity `omega`. A force F acts at a point whose position vector with respect to the axis of rotation is r. The power associated with torque due to the force is given by

A

`(vec(r )xx vec(F))vec(omega)`

B

`(vec(r )xx vec(F))xx omega`

C

`vec(r )xx(vec(F).vec(omega))`

D

`vec(r ).(vec(F)xx vec(omega))`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

A disc is rotating with angular velocity omega . If a child sits on it, what is conserved?

A rod is rotating with angular velocity omega about axis AB. Find costheta .

A disc rotates with angular velocity omega and kinetic energy E . Then its angular momentum

A disc of mass M and radius r is rotating with an angular velocity omega . If gently, two masses m each are placed at a distance r//2 on either side of the axis of rotation, what will be the new angular velocity ?

A heavy disc is rotating with uniform angular velocity omega about its own axis. A piece of wax sticks to it. The angular velocity of the disc will

Two discs of radii R and 2R are pressed against eachother. Initially, disc wit radius R is rotating with angular velocity omega and other disc is stationary. Both discs are hinged at their respective centres and are free to rotate about them. Moment of inertiaof smaller disc is I and of bigger disc is 2I about their respective axis of rotation. Find the angular velocity of bigger disc after long time.

A force vec(F)=4hati-10 hatj acts on a body at a point having position vector -5hati-3hatj relative to origin of co-ordinates on the axis of rotation. The torque acting on the body is

Let a force F be acting on a body free to rotate about a point O and let r the position vector of ant point P on the line of aciton of the force. Then torque (tau) of this force abot point O is defined as tau = rxxF Given, F = (2hati + 3hatj - hatk)N and r = (hati- hatj+6hatk)m Find the torque of this force.

During rotation of a body, the position vector is along X-axis and force vector is along Y-axis, The direction of torque vector is