Posted by Allie on Friday, April 20, 2012 at 4:48pm.
"Only two forces act on an object (mass = 3.90 kg), as in the drawing. (F = 76.0 N.) Find the magnitude and direction (relative to the x axis) of the acceleration of the object. " (The angle is 45 degrees and the horizontal force is 40N)

physics  Elena, Friday, April 20, 2012 at 5:01pm
Net force is F = 40 + 76•cosα =40 +76•0.707 = 93.74 N
a =F/m =93.74/3.9 = 24 m/s^2

physics  Elena, Friday, April 20, 2012 at 5:15pm
I’ve found the figure to this problem, so the solution is following.
x and y components of net forces are
F1(x) = 40 N, F1(y) =0
F2 (x) =76•cosα = 93.74 N,
F2 (y)= 76•sin α = 93.74 N ,
Net force
F(x)=133.74 N,
F(y) = 93.74 N.
F = sqrt(133.74^2 + 93.74^2) = 163.33 N
a =F/m =163.33 /3.9 = 41.88 m/s^2
Net force makes an angle β with xaxis,
tan β = 93.74/133.74 = 0.7
The direction of the acceleration of the object is β = 35o above the xaxis

physics  Allie, Friday, April 20, 2012 at 5:18pm
+y / F
 /
 /
 /
/a_ _ _ _ _ +x
40N
This is pretty much what the picture looks like. Your answer was incorrect!

physics  Elena, Friday, April 20, 2012 at 5:57pm
F1(x) = 40 N, F1(y) =0
F2 (x) =76•cosα = 53.74 N, F2 (y)= 76•sin α = 53.74 N ,
Net force F(x)=93.74 N, F(y) = 53.74 N.
F = sqrt(53.74^2 + 93.74^2) = 108 N
a =F/m =108 /3.9 = 27.7 m/s^2
Net force makes an angle β with xaxis,
tan β = 53.74/93.74 = 0.57
The direction of the acceleration of the object is β = 29.8o above the xaxis
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