A satellite of mass m is in circular orbit of radius 2re about the earth. What is the minimum amount of additional energy required to transfer the satellite to an orbit of radium 4re?.

With i really need the correct answer!

Which statement correctly describes the relationship between frequency and wavelength?

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.