8. What is the mass of an object if a force of 34 N produces an acceleration of 4 m/s/s? F = 34 N
F
34
m-
m-
m = 8.5 kg
a
4
a - 4 m/s

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?