An astronaut orbiting the earth is preparing to dock with a westar vi satellite. the satellite is in a circular orbit 500 km above the earth's surface, where the free-fall acceleration is 8.25 m/s2. take the radius of the earth as 6400 km. determine the speed of the satellite.

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.