A 4kg package is released from rest at point A and slides down a frictionless track until it reaches point B with a speed of 4.20 m/s. From point B it slides on a level surface with friction coefficient a distance of 3.00 m to point C, where it comes to rest. Calculate the height H Calculate the coefficient of kinetic friction on the horizontal surface.

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?