If a roller coaster has a gravitational potential energy of 15J and kinetic energy of 5J, what is the mechanical energy?

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

What is a possible result of higher air temperature caused by global warming

Which is special about a dc circuit ? a. it has both series and parallel components b. it has only series or only parallel components c. charge moves in a single direction d. charge moves back and forth quickly