An undiscovered planet, many lightyears from Earth, has one moon in a periodic orbit. This moon takes 1960 Ý 103 seconds (about 23 days) on average to complete one nearly circular revolution around the unnamed planet. If the distance from the center of the moon to the surface of the planet is 285.0 Ý 106 m and the planet has a radius of 3.50 Ý 106 m, calculate the moon\'s radial acceleration.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?