His model was not accepted by ancient philosophers because they said (1) if earth is rotating, why can't we feel the the motion of earth, and (2) if earth is orbiting the sun, then the position should be different when it is on opposite side of the sun (parallax effect).

How do you tell if someone actually cares about you? and just say they do?

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v