Gravity on the moons surface is much less than on earths surface because A. the moon has less mass than earth
B. the moon has less weight than earth
C. this statement is false, the gravity is the same
D. this statement is false, the weight is the same

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?