A 22 mm ×155 mm ×10mm book weighs 1.25 kg . It consists 500 sheets of paper ,each paper being equally thick find the volume of the book and area of each sheet​

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?