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## Homework Statement

a block of mass 100 kg is being moved steadily by pulling on a rope attached to the block making an angle of 30 degree with the horizontal. if the tension of the rope is 120 N, what is the coefficient of friction?

## Homework Equations

T- Ff = ma

F= μR

## The Attempt at a Solution

R= mg cos x = 850 N

mg sin x = 490 N

a = 0, F= Ff

Ff = 120 N

F= μR

120= μ(850)

μ= 0.141

* ( answer given μ= 0.113. where is my mistake?)