Describe two situations in which it is possible to double the mass of an object without changing the momentum of the object. Pls help I just want to pass the class://:

Ascientific blank must be testable and capable of being proven false?

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?

Which word expression describes how much to calculate pressure