Consider vector A⃗ with components Ax and Ay. Derive an expression, in terms of Ax and Ay, for the components of B⃗ (Bx and By) if B⃗ satisfies the vector equation A⃗ + 4B⃗ = 3A⃗ . Express your answer in terms of Ax and Ay separated by a comma.

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?