Anna applies a force of 19.5 newtons to push a book placed on a table. if the normal force of the book is 51.7 newtons, what is the coefficient of kinetic friction? a0.01 b0.20 c0.38 d0.48

Explanation:

As we know that the normal force on the book is given as

also the force required to push the book on the table is given as

now by the formula of friction force we know that

now plug in all values in it

here we will have

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge