Jill puts her face in front of a convex mirror, 18 cm from the focal point of the mirror. if the focal point is located 12 cm from the mirror, where will her image appear? a. 4 cm behind the mirror b. 8 cm behind the mirror c. 4 cm in front of the mirror d. 8 cm in front of the mirror

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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.

Relative to the ground below, how many joules of potential energy does a 1000-kg boulder have at the top of a 5-m ledge?