Question

The weightless strut in the figure below is not attached to the wall; it is prevented from falling only by friction. (Let w = 360 N, L = 5.25 m and h = 3.25 m.)

(a) Find the magnitude of the force of friction between the wall and the strut.

Correct: Your answer is correct.


(b) Find the normal force exerted by the wall on the strut.

Incorrect: Your answer is incorrect.


(c) Find the minimum coefficient of static friction.


for part A) tan^-1(3.25/5.25)=31.76 degrees
T=360/2sin31.76= 342 N
V=w-Tsin31.76= 360-342sin31.76= 180 N

part B) H-Tcos31.76 = 0
H=Tcos31.37 = 342cose31.76 = 290.79 N but it says my answer is wrong.

Answer 1

Not sure why your answer is wrong when the question is not even complete.