Can SomeOne Help Me ?

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.