Which of the following statements is true?
a.
surface water can become groundwater, but groundwater cannot become surface water.

b.
surface water can seep downward to become groundwater.

c.
groundwater can become surface water, but surface water cannot become groundwater.

d.
surface water and groundwater are unrelated.

Rubber on floor tile has a coefficient of kinetic friction of 1.0 and a coefficient of static friction of 2.0. how much force would a 3.5 lb. robot need to produce in order to start moving?

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

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?