Recent content by johnnyboy53

One more question, For the line of charge equation, can we take the r in the numerator and put it on the outside of the summation/integral since it is constant? Thank you both for your input and also thank you rob for the great explanations. They made it much more clear. I have looked into the...

Homework Statement I am going through the example problems in the book and it shows me how to find the electric field of a line of charge, which is this http://imageshack.us/a/img24/8932/img0303fq.jpg I get to this part where they change ΔQ to (Q/L)ΔY...

oh 1 cm = .01m. what do you mean by dropping powers of 10? Instead of writing .01m, do i keep it as (1 * 10^-2)?

Homework Statement Two 2.0cm diameter disks face each other, 1.0mm apart. They are charged to -10nC and 10nC. -What is the 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...

Hypotenuse of the triangle would be: y=Mslope*x Mslope = B/A y=(B/A)x x=(A/B)y is that right? That's what i did on my attempt

oh wow i forgot the picture. Sorry! The lines are the dy's

Homework Statement Find the Y component of the Center of Mass http://img607.imageshack.us/img607/7122/83370796.png Homework Equations ∫(r*dm)/M The Attempt at a Solution I keep coming up with (2/3)B but i know since that there is more mass near the origin axis, it should be...

Homework Statement I am seeing the steps on others who have worked this out and they are taking the pin as the pivot position. I thought a force's line of action that passes the pivot position produces zero torque? So i tried to make the center of mass the pivot position and each...