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vforvirginia
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Homework Statement
The 2.1mm diameter spheres in the figure are released from rest. What are their speeds vc and vd at the instant they collide?
Spheres:
C has 2nC of charge and a mass of 1g.
D has -1nC of charge and a mass of 2g.
The starting distance between the two spheres is 10mm. Each sphere as a diameter of 2.1mm.
Homework Equations
V=(1/4pi*ε_0)*Q/r
Q is the charge and r is the distance between the two spheres.
K=.5*mv^2
The Attempt at a Solution
ΔKC+ΔUC = 0 = ΔKD+ΔUD
Ki for spheres C and D are 0 since the spheres begin at rest:
KCf+UCf-UCi=KDf+UDf-UDi
The rest of my attempt is basically putting the numbers in and solving for KCf in terms of KDf and then using that to get KDf. I just want to know if I am heading in the right direction.