A student standing on a freely spinnable platform is at rest and holding up a counterclockwise spinning gyroscope as in the picture. If the student suddenly flips the gyroscope upside down, what will happen to them on the platform?

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?