Solving for coefficient of friction

[tep]

1. a worker can supply a maximum pull of 150 lb on a cart w/c has a handle set at an angle of 40° above the horizontal. what is the coefficient of friction if he can just move a total load of 1500 lb ?



2. μ = Ff/mg



3. so i solved it by 150sin(40) divide by 1500cos(40), but I'm not sure if it is correct... please help :)

 

[Simon Bridge]

Please show your working and reasoning.

 

[tep]

my answer is 0.083 but I'm not sure if its correct.

 

[Simon Bridge]

That's answer ... please show your working and your reasoning.
Without this information I cannot help you properly.
I don't think you've summed the forces properly but I don't know.

i.e.: you did: 1500cos(40) - how did you decide to do that? What does that figure represent?
Did you draw a free-body diagram? What?