Question: A semi - circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction

A semi

-

circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semicricular disc and horizontal surface is

.

This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

.

Remain horizontal

.

Slant up towards direction of pull

.

Slant down towards direction of pull

.

Unpredictable

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