4. 4.{a} What is the kinetic energy of our moon in its orbit around Earth? {Assume Earth's reference ame.) 4.03} What is the kinetic energy of our planet, Earth, around the sun? 4.{c} How would an answer to (a) have to be changed if we instead asked for the kinetic energy of the moon from the reference frame of the sun, instead of Earth? Show a labelled diagram to support your explanation and then calculate this new kinetic energy for the moon. How does this new kinetic energy amount compare to the result you obtained in (a)? 4.{d} What is the gravitational potential energy of our moon with respect to the Earth? Assume the surfaces of these two very large bodies are to remain intact -- (i.e. they cannot go past their respective radii in the sense that neither can 'erash through' the other, they would have to stop just as their surfaces are theoretically imagined to make contact}. 4.{e} If for some inexplicable reason Earth was to suddenly stop orbitting the sun, what would be its impact velocity,r at the point just as its surface contacted the sun's surface (assume massive melting or other damage occurs -- i.e. their respective radii stay intact, similar to part {d})