2000 Pieces of paper are used everyday at a local school. Each piece of paper is 600cm^2. Convert the area of all the paper used in one day to m^2. The answer is 120 m^2 someone please help me understand this with dimensional analysis?

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

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

Aproton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?