Suppose that a meter stick is supported at the center , and a 40-N block is hung at the 80-cm mark . Another block of unknown weight just balances the system when it is hung at the 10-cm mark. What is the weight of the second block? (photo attached above)​

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?