Physics-
General
Easy
Question
A uniform meter stick of mass M is hinged at one end and supported in a horizontal position by a string attached to the other end as shown in figure. If the string is cut, then the initial angular acceleration of the stick is-
- g rad/s2
- 3g rad/s2
- 3g/2 rad/s2
- 6g rad/s2
- g rad/s2
- 3g rad/s2
- 3g/2 rad/s2
- 6g rad/s2
The correct answer is: 3g/2 rad/s2
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A circular wooden hoop of mass m and radius R rest on a horizontal frictionless surface. A bullet, also of mass m and moving with a velocity V, strikes the hoop and get embedded in it. The thickness of the is much smaller than R. The angular velocity with which the system rotates after bullet strikes the hoop is –
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A disc of moment of inertia I is rotating about its axis, which is initially along the vertical direction, making ‘n’ revolution per minute. The axis gradually tilts becomes horizontal and the disc rotates about the horizontal axis with the same revolution per minute. The total time, taken in doing so is t seconds then the torque acting on the body is–
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