The diameter of a watermolecule is 0.000000000275 m. How can this number best be expressed in scientific notation

2.75x10⁻¹⁰m

Explanation:

By scientific notation, we have to express 0.000000000275 m in powers.

This can be done by counting the number of zeros after the decimal and the number after 0 which is 2.

from 2 to the decimal point, we have 10 characters

so we express it scientifically as,

= 2.75x10⁻¹⁰m

for easy understanding. i have added an attachment to help you out on how to do this.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .