A crate is pulled by a rope that makes an angle of above the horizontal on a level floor

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

25\,\text{kg}

crate is pulled by a rope that makes an angle of

20^{\circ}

above the horizontal on a level floor. The coefficient of static friction between the crate and the floor is

\mu_s = 0.40

. What is the minimum tension in the rope required to start the crate moving? (Use

g = 9.8\,\text{m}\!/\!\text{s}^2

.) (a)

122\,\text{N}

(b)

104\,\text{N}

(c)

91\,\text{N}

(d)

98\,\text{N}