Using the binding energy versus nucleon number, is this a high amount of binding energy per nucleon?

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

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?

Which of these metals are magnetic?