3 years ago

How many protons are in the radioactive isotope 40/19K?

1 answer:

8 0

First we have to establish that the number of protons is equivalent to the atomic number of element. Here I am assuming that you are referring to Potassium (K) - 40. Potassium, stable or unstable has 19 protons.

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If it requires 2.0 J of work to stretch a particular spring by 2.0 cm from its equilibrium length, how much more work will be re

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16 J

Explanation:

It is given that,

Work done, W = 2 J

A spring is stretched by 2.0 cm from its equilibrium length

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Let k is the spring constant of the spring. When W = 2J, and x = 2 cm, then energy required to stretch the spring is :

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