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## Homework Statement

Multiple-Concept Example 3 provides some pertinent background for this problem. Suppose a single electron orbits about a nucleus containing two protons (2e), as would be the case for a helium atom from which one of the two naturally occurring electrons is removed. The radius of the orbit is 2.65 x 10^11 m. Determine the magnitude of the electron’s centripetal acceleration.From the example on that page

Given:

Electron charge -1.60 x 10^-19 C

Electron mass 9.11 x 10^-31 kg

Proton charge +1.60 x 10^-19 C

Radius of orbit 5.29 x 10^-11 m

## Homework Equations

F = (k)(q1)(q2) /r^2

Fc=Ac x M

Ac=Fc/M

## The Attempt at a Solution

I don't even know where to begin with this problem. Yes it's a chug and plug problem but the book is being annoyingly vague. The example it was referring me to was for a hydrogen atom. I'm not sure if I was supposed to use the values from the example but otherwise they really didn't give me ANYTHING besides the radius to find the force of the electron.

From using the Charges from the example (1.6x10^-19 ), I get 3.27x10^-7 .

Plugging that number in to find the acceleration, using the mass of the electron from the example I get 3.60x10^23

The answer in the back says 7.19x10^23 m/s^2