Ablock of wood with the density of 780 kg/m^3 has a cubic shape with sides 0.259m long. a cord of negligible mass is used to tie a piece of lead to the bottom of the wood. the lead pulls the wood into the water until it is just completely covered with water. what is the mass of lead? density of water 1000kg/m^3 and density of lead 11300 kg/m^3

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?