An unusual spring has a restoring force of magnitude f = (2.00 n/m)x + (1.00 n/m2)x2, where x is the stretch of the spring from its equilibrium length. a 3.00-kg object is attached to this spring and released from rest after stretching the spring 1.50 m. if the object slides over a frictionless horizontal surface, how fast is it moving when the spring returns to its equilibrium length?

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?

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force