Physics

Problem

20\,\text{kg}

crate is to be just set into motion on a horizontal floor by pulling it with a rope that makes an angle of

30^{\circ}

above the horizontal. If the coefficient of static friction between the crate and the floor is

\mu_s = 0.40

and

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

, the minimum magnitude of the force required is closest to a)

92\,\text{N}

80\,\text{N}

75\,\text{N}

95\,\text{N}