ahuebel
I have this problem where we have to determine the radius between an electron orbiting a proton. It is assumed they attract eachother with a 1/r^2 electric force. I assume this means they follow coloumb's law of k(q1*q2/r^2). The first part of the question asks...if the period of orbit is 24 hr, what is the radius.

At first I thought...gee an electron travels at the speed of light and it travels pi*d meters so solve for d and that is my answer. That is way to easy....So then I thought, perhaps I need to find this force of attraction as a function of r and then use that to find angular velocity and tangential acceleration and so on. Any ideas where to start on this one?

TIA

$$a=\frac{v^2}{r}$$
You can find the mass of an electron on a table of constants. There is probably one in the front of your physics textbook. The mass is $9.109 \times 10^{-31}kg$. As for those angular equations you mentioned, they are valid and you can solve the problem with or without them.