I'm stuck on two problems 1 is #8(please see the pdf file):(adsbygoogle = window.adsbygoogle || []).push({});

I know I have to solve this equation with this:

F=MA

I calcualated F by taking the magnitude of Fx and Fy:

Fx=390*cos(9)i+335*cos(-28)

Fy=390*sin(9)i+335*sin(-28)

I got F as 687.756

and the mass is given: 3819kg

So I divided those and I got the answer as .180 but the comp. says it's wrong.

The second problem is 12(please see the pdf file):

I know I have to do this:

F = m*g-m*a*cos(angle)

(is it right?)

(I calculated the acceleration and it is right)

so F = 3.35*9.8-3.35*5.67*cos(27)

and I got 26.06. What's wrong? with this?

Thanks in advance for the help.

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# Need help by tonight(again)!

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