Universal Gravitation

  • Thread starter hshphyss
  • Start date
  • #1
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Can anyone help me with this problem?

Approximate the gravitational force of attraction between a 46.0 kg girl and a 52.0 kg boy if they are sitting 3.0 m apart in physics class.

Since the formula is [(m1m2/r^2)]G=Fg. So I first tried [(46+52)/3^2]6.67e-11 and I got 7.27e-10. Then when the answer didn't work I thought maybe I was given the diamter, so i divided by 2, so I [(46+52)/1.5^2]6.67e-11, and I got 2.91e-8 and that was wrong to. I only have one more submission left to get this problem right, if you could help me it would be grately appreciated. Is there somthing special I need to do that I am missing? Thank-you
 

Answers and Replies

  • #2
Pengwuino
Gold Member
4,989
16
m1m2 = m1 * m2, not m1 + m2
 
  • #3
45
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yeah thats what i did wrong... thank-you
 
Last edited:

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