# Homework Help: Nucleus of 8Be help

1. Feb 25, 2004

Ok, the problem is:

The nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons).

(a) What is the force between the two alpha particles when they are 3.80e-15 m apart, and

(b) what will be the magnitude of the acceleration of the alpha particles due to this force?

Alright, so I used the formula: F = (k q1 q2) / r^2

the radius is given as 3.80e-15, k is 8.99e9, and im stuck at q1q2

I used 1.6e-19^2 (The charge of a proton, I used it as q1 and q2, so it is squared)

and with that, i got F = 15.94

for part (b), i used F=ma to try to get acceleration. I used the mass of a helium atom and got 3981.90

both were marked incorrect...

i need urgent help, this is the only prob on a webassign I can't get... It is due at 11 tonight, so any help would be greatly appreciated

thanks

2. Feb 25, 2004