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The net external torque on a system of p...

The net external torque on a system of particles about an axis is zero. Which of the following are compatible with it ?

A

The forces may be acting radially from a point on the axis

B

The forces may be acting on the axis of rotation

C

The forces may be acting parallel to the axis of rotation

D

All of the above

Text Solution

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The correct Answer is:
D
`bar(tau)=vec(r)_ xx vec(F)`
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NARAYNA-SYSTEM OF PARTICLES AND ROTATIONAL MOTION -EXERCISE - IV
  1. Choose the correct alternative :

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  2. Figure shows two identical particles 1 and 2 , each of mass m ...

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  3. The net external torque on a system of particles about an axis is zero...

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  4. A uniform cube of mass m and side a is placed on a frictionless ...

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  5. A uniform uniform sphere of mass m and radius R is placed on a ro...

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  6. A T shaped object with dimesions shown in the figure , is lying a...

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  7. A circular ring of mass 6kg and radius a is placed such that its cente...

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  8. In the figure d shown a hole of radius 2 cm is made in a semicir...

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  9. The figure shows the positions and velocities of two particles . ...

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  10. A rod of length 3m and its mass par unit length is directly propo...

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  11. A wheel is rotating about an axis through its centre at 720 rp...

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  12. A particle of mass m describes a circle of radius r . The centripetal ...

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  13. A particle moves in a circular path of radius R with an angular veloci...

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  14. A chain couples and rotates two wheels in a bicycle . The radii ...

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  15. Five particles of mass 2 kg are attached to the rim of a circular disc...

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  16. Four masses are fixed on a mass less rod as shown in Fig . The momen...

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  17. A rigid body can be hinged about any point on the x-axis. When it is h...

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  18. Four similar point masses ( each of mass m ) are placed on ...

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  19. Three particles are connected by mass less rods lying along the...

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  20. The diagram showm a uniform of mass M & radius 'a' . If the mome...

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