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 naturally occurring electrons is removed. the radius of the orbit is 2.99 × 10-11 m. determine the magnitude of the electron's centripetal acceleration.

Electron's centripetal acceleration,

Explanation:

Given that,

The radius of the orbit,

The centripetal force is balanced by the electrostatic force such that,

Here, and

So, the magnitude of the electron's centripetal acceleration . Hence, this is the required solution.

c. magnitude and direction

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.