Physics

Problem

On a rough plane inclined at

30^{\circ}

to the horizontal, a

5\,\text{kg}

block is to be prevented from sliding down by pressing it against the plane with a force

P

acting perpendicular to the surface. The coefficient of static friction between the block and the plane is

0.3

. Determine the minimum value of

P

. Take

g = 10\,\text{m}\,\text{s}^{-2}

. a)

58\,\text{N}

40\,\text{N}

25\,\text{N}

83\,\text{N}