Calculating Gravitational Force: Baby vs Mars

[LoveKnowledge]

1. Calculate the force of gravity between a newborn baby of mass 3 kg and the obstetrician of mass 100 kg, who is 0.5 m from the baby. Which exerts more gravitational force on he baby, Mars or the obstetrician? By how much?



2. F = G m1m2/d2



3. Fg = (Gm1 Gm2) /d^2 =Fg= g ( 3.00 kg)(100.0 kg)/0.5m^2 =Fg= (6.67 E -11 N*m2/kg2)( 3.00 kg)(100.00 kg)/0.5m^2

I don't seem to know how to do the math following plugging the equations together :(

 

[Pagan Harpoon]

You're notation is a bit messy, I think, you have an extra G appearing and you're switching between g and G for the gravitational constant.

You've inserted the numbers right, though. Now just put the expression into a calculator to get a value for the force.

Then you'll need to look up the mass of Mars and how far away it is and replace 100kg with the mass of Mars and 0.5m with the distance to Mars. It's worth noting that the distance to Mars will vary because both Earth and Mars are moving. Maybe you could take the average distance or the maximum distance or the minimum distance, that's up to you, really.

 

[The_big_dill]

i don't seem to know how to do the math following plugging the equations together :( [/b]

bedmas