16' wide and 44' long. if a piece of plywood has 32 sq. ft., how many pieces of plywood does the customer need to cover the floor?

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?