A 200 kg lead ball and a 2 gram styrofoam ball both of equal size are dropped simultaneously form a set height on the moon. Which will reach the moon's surface first? Why is this so?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.