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A block is placed on a horizontal table ...

A block is placed on a horizontal table which can rotate about its axis.The block is placed at certain distance from centre as shown in figure. Table rotates such that particle does not slide. See possible direction of net acceleration of block at the instant shown in figure

`{:(,"Column-I","Column-II"),(,(A)"When rotation is clockwise with constant "omega,(P)1),(,(B)"When rotation is clock wise with decreasing "omega,(Q)2),(,(C)"When rotation is clockwise with increasing "omega,(R)3),(,(D)"Just after clockwise rotation beings from rest",(S)4):}`

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The correct Answer is:
A, B, C, D
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Knowledge Check

  • A rod can rotate in a horizontal plane about its one end. A bead which can move along the rod is placed at certain distance from the axis or rotation. The bead does not to friction. The rod has a constant angular acceleration

    A
    the normal reaction on the bead will be constant h magnitude and direction both
    B
    the magnitude of the normal reaction on the bead will be variable
    C
    the magnitude of friction force on the bead will be constant
    D
    the magnitude of friction force on the bead will be variable

  • A sphere of mass m is rotated about its axis by an angular velocity omega and lowered gently on an inclined plane as shown in figure. Then initally

    A
    the centre of mass of sphere accelerates upwards.
    B
    the centre of mass of shpere accelerates downwards
    C
    the lowest point of contact accelerates upwards.
    D
    the lowest point of contect accelerates downwards.

  • A small objective placed on a rotating horizontal trun table just slip when it is placed at a distance 4cm from the axis of rotation. If the angular velocity of the trun-table doubled, the objective slip when its distance from the axis of ratation is.

    A
    `1cm`
    B
    `2cm`
    C
    `4cm`
    D
    `8cm`

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