Home
Class 11
PHYSICS
A thin horizontal disc of radius R=10cm ...


A thin horizontal disc of radius R=10cm is located with in a cylindrical cavity filled with oil whose viscosity `eta=0.08`P (figure) The distance between the disc and the horizontal planes of the cavity is equal to `h=1.0` mm find the power developed by the viscous forces acting ont he disc when it rotates with the angular velocity `omega=60rad//s`. The end effect are to be neglected.

Text Solution

Verified by Experts

The correct Answer is:
9 W
Promotional Banner

Topper's Solved these Questions

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN|Exercise Exercise 5 A (Previous year Questions)|29 Videos

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN|Exercise Exercise 5 B (MCQ)|13 Videos

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN|Exercise Exercise 4 A (Viscosity)|3 Videos

  • CENTRE OF MASS

    ALLEN|Exercise EXERCISE-V B|19 Videos

  • ERROR AND MEASUREMENT

    ALLEN|Exercise Part-2(Exercise-2)(B)|22 Videos

Similar Questions

Explore conceptually related problems

L is a smooth conducting loop of radius l=1.0 m & fixed in a horizontal plane.A conducting rod of mass m=1.0 kg and length slightly greater than l higed at the centre of the loop can rotate in the horizontal plane such that the free end slides on the rim of the loop.There is a uniform magnetic field of strength B=1.0 T directed vertically downward.The rod is rotated with angular velocity omega_(0)=1.0 rad//s and left.The fixed end of the rod and the rim of the loop are connected through a battery of e.m.f E a resistance R=1 Omega , and initially uncharged capacitor of capacitance C=1.0 F in series.Find (i)the time dependence of e.m.f M such that the current I_(0)=1.0 A in the circuit is contant. (ii)energy supplied by the battery by the time rod stops.

A disc of mass m and radius R is free to rotate in a horizontal plane about a vertical smooth fixed axis passing through its centre. There is a smooth groove along the diameter of the disc and two small balls of mass m//2 each are placed in it on either side of the centre of the disc as shown in Fig. The disc is given an initial angular velocity omega_(0) and released. The angular speed of the disc when the balls reach the end of the disc is

A disc of mass m and radius R is free to rotate in a horizontal plane about a vertical smooth fixed axis passing through its centre. There is a smooth groove along the diameter of the disc and two small balls of mass m//2 each are placed in it on either side of the centre of the disc as shown in Fig. The disc is given an initial angular velocity omega_(0) and released. The net work done by forces exerted by the disc on the ball for the duration ball remains on the disc is

A horizontally oriented uniform disc of mass M and radius R rotates freely about a stationary vertical axis passing through its centre. The disc has a radial guide along which can slide without friction a small body of mass m . A light thread running down through the hollow axle of the disc is tied to the body initially the body was located at the edge of the disc and the whole system rotated with ann angular velocity omega_(0) . Then by means of a force F applied to the lower and of the thread the body was slowly pulled to the rotation axis. find: (a). The angular velocity of the system in its final state. (b). The work performed by the force F.

A disc shaped body (having a hole shown in the figure) of mass m=10kg and radius R=10/9m is performing pure rolling motion on a rough horizontal surface. In the figure point O is geometrical center of the disc and at this instant the centre of mass C of the disc is at same horizontal level with O . The radius of gyration of the disc about an axis pasing through C and perpendicular to the plane of the disc is R/2 and at the insant shown the angular velocity of the disc is omega=sqrt(g/R) rad/sec in clockwise sence. g is gravitation acceleration =10m//s^(2) . Find angular acceleation alpha ( in rad//s^(2) ) of the disc at this instant.

A smooth disc of mass M and radius (L)/(sqrt(3)) is placed at rest horizontally on a smooth horizontal surface. A massless pin is fixed at point P at a distance L//2 from centre O of the disc as shown in the figure. Now a thin uniform rod of mass M and length L is placed horizontally on the surface of the disc parallel to the line OP such that its mid point and centre O of the disc just coincide as shown in figure. Now rod has given angular velocity omega_(0)=24 rad//sec in counter clockwies direction as shown. As a result, the end of the rod strikes the pin P and stricks to it rigidly. Calculate the angular velocity of disc just after collision.

A disc of mass 'm' and radius R is free to rotate in horizontal plane about a vetical smooth fixed axis passing through is centre. There is a smooth groove along the diameter of the disc and two small balls of mass m/2 each are placed in it on either side of the centre of the disc as shown in fig. The disc is given initial angular velocity omega_(0) and released. The angular speed of the disc when the balls reach the end of the disc is -