Question

Find the gravitational force between earth and the sun.

I am using the formula Fg = (G*m1*m2)/(r^2) where G = 6.67*10^-11
m1 = 6.0*10^24kg
m2 = 2.0*10^30kg
r = should i use the sun's radius or the earths (Rearth = 6.38*10^6; Rsun = 6.96*10^8)

either way i use i am not gettin the required answer of 3.57*10^22N

Answer 1

Neither. The "r" in the universal law of ravity is the distance between the two bodies (about 150 million km in this case). Make sure it is in meters.

Answer 2

earths mass is 5.97x10^24kg, and the earths radius is 6.37x10^8 what is the earths escape velocity of surface? G=6.67X10^-11 Kg^-11 m^3 s^2