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Friction and Surface Area of the Object

A block rests...

Question

A block rests on a rough inclined plane making an angle of 30 with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10N, the mass of the block (in kg) is $[g = 10 m s^{- 2}]$

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Solution

The correct option is D 2
The maximum friction force is $= m g s i n 30^{o} = 10 \Rightarrow m = 2.0 K g$

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