Given in the figure are two blocks $A$ and $B$ of weight $20\, N$ and $100\, N$, respectively. These are being pressed against a wall by a force $F$ such that the system does not slide as shown. If the coefficient of friction between the blocks is $0.1$ and between block $B$ and the wall is $0.15$, the frictional force applied by the wall on block $B$ is ........ $N$

820-1741

  • A

    $120$

  • B

    $150$

  • C

    $100$

  • D

    $80$

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A block of mass $5\,kg$ and surface area $2\,m ^2$ just begins to slide down an inclined plane when the angle of inclination is $30^{\circ}$. Keeping mass same, the surface area of the block is doubled. The angle at which this starts sliding down is :