Calculating the force of friction on an object

[purplecows]

Homework Statement

A 40.0-kg object is being pulled along a horizontal surface by means of a rope that exerts a force of 200 N at an angle of 30° below the horizontal. The coefficient of static friction between the object and the surface is 0.40. The force of friction on the object is:
A) 197 N
B) 173 N
C) 392 N
D) 157 N

Homework Equations

µ_s = F_s/ F_n

The Attempt at a Solution

So I got 197 N, which was A. However, the answer was B on the answer sheet. What have I done wrong?

 

[rude man]

I think you mean 'coefficient of dynamic friction'.

Your drawing is hard to decipher.

 

[tiny-tim]

hi purplecows! welcome to pf!

So I got 197 N, which was A.

so do i

(are you ok on your other thread?)

 

[rude man]

The answer is B and it's correct.

There are a lot of red herrings in this problem! I fell for the "static friction" coefficient myself.

The force is already given, so things like friction coefficients and mass are irrelevant.

 

[Nickie]

Your attempt at a solution is correct. The answer should be A, 197 N. It is possible that there was a mistake on the answer sheet or a typo. It is always important to double check your work and calculations, but in this case, your answer is correct.