At this point in the year, everything is fair game for you, so any question you have is fair game for me. Feel free to ask me anything you have covered in the course (or even things from last semester that might come up).
On that note, a piece of wisdom from my 3rd year mechanics professor:
You don't have problems, you have exercises! ~Dr. Melvin Calkin
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a question from the text
Two point charge of 9.5 microC, 3.5cm away from each other, are released, how fast will each be moving when they are very far away from each other? (each has a mass 0.1mg)
I used this equation: PE=KE --> kQ1Q2/R=1/2mv^2, and I got 6.8E3 m/s, which is different from the answer 4.8E3 m/s.
Is this answer a typo or I'm wrong?
Hi Elaine,
I should have an answer for you shortly. For some reason I'm getting yet another answer (8.5e-11J)... going to recheck my math. I think the short answer to your problem is that you somehow have a ΔV when V is being held constant. Instead try it using PE=(1/2)CV^2.
I'll put up the full answer shortly.
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