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**Electron orbiting proton--orbital radius??**

**1. Homework Statement**

In the Bohr model, the electron is imagined to move in a circular orbit about a stationary proton. If the speed of the electron were 8.9e5 m/s, what would be the corresponding orbital radius?

2. Homework Equations

3. The Attempt at a Solution

Fe=ma

a=Fe/m

(v^2)/r=(kqq/r)/m

v^2rm=kqq

(8.9e5)(r)(9.11e-31)=(9e9)(1.6e-19)(-1.6e-19)

r=-2.842e-4m

I hope you can help!!

--aweg