A uniform meterstick is balanced upon a pivot at the 50 cm mark. A 4.1 kg mass is suspended from 20 cm mark, and a 0.9 kg mass is suspended from the 60 cm mark. How much force (In Newtons) must be applied to the far right end of the meterstick (the 100 cm mark) to support the load from falling?

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?