Myron decides to run some errands. While doing so, he drives 1 mile north, four miles east, then one mile south. What is the total distance Myron drove? What is his displacement? (Don't forget that displacement is a vector!)

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?