Calculating Force of Gravity Between Earth & Mars

[LoveKnowledge]

1. Calculate the force of gravity between a newborn baby (mass=3kg) and the planet Mars (mass=6.4 X 10^23 kg) when Mars is at its closest to Earth (distance=5.6 X 10^10 m).



2. F= G m1m2/d2



3. I got this far and I don't know how to break down the equation any further: F= G M m /R^2= 6.67300 × 10^-11 m^3 kg^-1 s^-2 *6.4 x 10^23 kg *3.00 kg/(8*10^10 m)^2

 

[Redbelly98]

I haven't checked all your numbers but it looks reasonable. Just calculate what the result is on your calculator.