A point mass of 3.8kg is on the x axis at x=8.2 and an equal point mass is on the y axis at y=5.9. What is the magnitude of the gravitational field from these two masses at the origin?(adsbygoogle = window.adsbygoogle || []).push({});

Well for this problem I tried using the equation F= G m1 m2/ r^2

for r I added 8.2 and 5.9

for G I used the number given in my book 6.67E-11

I am thinking that maybe I am not finding r the right way but then I found this equation in my book

F1,2 =( - G m1 m2 / r^2 (1,2) ) * r1,2

and am now very confused. Please help me sort out this mess!

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# Homework Help: Two masses and a Gravitational field

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