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?

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?