When an object is lifted 8 meters off the ground, it gains a certain amount of potential energy. if the same object is lifted 16 meters off the ground, its potential energy is a. four times as much. b. three times as much. c. twice as much. d. the same.

Which best represents the law of conservation of mass ?

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?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?