Calculate the force of gravity on a 1-kg mass if it were 6.4 x 10^6 m above Earth's surface (twice Earth's radius).(adsbygoogle = window.adsbygoogle || []).push({});

Known: Mass of object 1 = 1 kg

Mass of Earth = 6 x 10^24 kg

Earth's radius = 6.4 x 10^6 m; 2x this is 1.28 x 10^7 m

G = 6.67 x 10^-11 N*m^2/kg^2

Equation: F = G(Mass of object)(Mass of Earth)/(Distance)^2

= (6.67 x 10^-11 N*m^2/kg^2)(1 kg)(6 x 10^24 kg)/(1.28 x10 ^7 m)^2

= 2.4 N

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Did I do this correctly?

**Physics Forums | Science Articles, Homework Help, Discussion**