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A block of mass m is placed on a rough h...

A block of mass m is placed on a rough horizontal surface. The coefficent of friction between them is `mu`. An external horizontal force is applied to the block and its magnitude is gradually increased. The force exerted by the block on the surface is R.

A

The magnitude of R gradually increase.

B

`R le mg sqrt(mu^(2)+1)`.

C

The angle made by R with the vertical will gradually increase.

D

The angle made by R with the vertical `le tan^(-1)mu`.

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A, B, C, D
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