Recent content by helpmymaths

you mean a = v^2 / r

so I divide out m and get 1/2v^2 - GM/r = E/m so to replace v I would use mv^2/r = v = √r/m but I don't know what to do with that last m

What is GM/r ? Is that the gravitational force of the entire earth? What's throwing me off is how to use this in E = K +U. 1/2mv^2/r - GMm/r = E ? If that is correct would I then multiply by three?

Homework Statement How much energy per unit mass (E/m) must you give a rocket to put it into a geosynchronous orbit three Earth radii above the surface of the Earth? Radius of Earth : 6380 km GM/r = 6.25 x 10^7 m^2/ s^2 Homework Equations U(r) = - GMm/r The Attempt at a...