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

A wooden block with a coin placed on its top, floats in water as shown in figure . The distance L and H are shown in the figure .after sometime the coin falls into the water , then

L decreases

h decreases

L increases

h increases

`(1)/(2pi) sqrt((k)/(M))`

`(1)/(2pi) sqrt((k)/(2M))`

`(1)/(2pi) sqrt((2k)/(M))`

`(1)/(2pi) sqrt((M)/(k))`

a direct current flows in the ammeter A.

no current flows through the ammeter A.

an alternating sinusoidal current flows through the ammeter A with a time period `T=(2pi)/omega`

a time varying non-sinusoidal current flows through the ammeter A.