Please help check my answer.

Question

alones · Answer

Wait so where's your answer?

goldie1962 · Answer

The direction of the resultant force is 60 degrees and the magnitude of the resultant force is 129.90 pounds.

mathmale · Answer

Goldie, the work you have done demonstrates that you have a good grasp of this material.   Both the magnitude of your resultant force and the angle this force makes with the horiz. look appropriate.

My first thought, when I saw your post, was that a sketch might help you check your own answer.

Perhaps others on OpenStudy would be willing to do the entire problem themselves to be able to tell you whether you're right or wrong.  I just don't have the time or energy to do that now.   However, were you in any doubt about any part of your solution, and you mention just that one part, I'd be more than willing to take a look and give you feedback.

goldie1962 · Answer

Thank you. Yes I was hoping someone would go through the whole problem. No worries though I understand, this problem is pretty long. Thanks again for giving it a look!

jim_thompson5910 · Answer

on the line that has 
`z = x + y = <64.95, 112.5>`
The value 64.95 is incorrect

jim_thompson5910 · Answer

I think I know where you got it from

75*cos(150) = 75*(-sqrt(3)/2)=-64.951905283833

goldie1962 · Answer

Oh, is the answer supposed to be negative?

goldie1962 · Answer

I keep getting the same answer haha

jim_thompson5910 · Answer

x = 150[cos(30 deg), sin(30 deg)] = <129.90, 75> y = 75[cos(150 deg), sin(150 deg)] = <-64.951905283833, 37.5> now add vectors x and y to get vector z

jim_thompson5910 · Answer

show me what you get for vector z

goldie1962 · Answer

<64.95, 37.5>

goldie1962 · Answer

Sorry i made a mistake

goldie1962 · Answer

<64.95, 112.5>

jim_thompson5910 · Answer

attachment

goldie1962 · Answer

What mistake did I make?

jim_thompson5910 · Answer

15*cos(30) = 12.9903810567666
75*cos(150) = -64.951905283833


12.9903810567666 + (-64.951905283833) = -51.9615242270664

So -51.9615242270664 should be the x coordinate of vector z

jim_thompson5910 · Answer

oh wait, I messed up

jim_thompson5910 · Answer

150*cos(30) = 129.903810567666
75*cos(150) = -64.951905283833


129.903810567666+(-64.951905283833) = 64.951905283833


never mind, you had it correct all along. It was my mistake

goldie1962 · Answer

No prob :) are you sure my work is correct?

jim_thompson5910 · Answer

everything else looks correct. Nice work

goldie1962 · Answer

Thank you for your time and help!

jim_thompson5910 · Answer

no problem