How much energy would be required to move the earth into a circular orbit with a radius 2.0 kmkm larger than its current radius

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?