If you were at rest in a spaceship far away from any planets or stars, would you have any weight? What would happen if you turned on your engines and accelerated? What would you have to do to feel like you weighed the same as you do on Earth? Explain why a planet’s gravity could produce these same effects.

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?