Answer:
Gravity as well as electrostatic and magnetic attraction and repulsion provide real life examples of forces being exerted by one object on another without them being in contact with each other.
Explanation:
Hope that helps!:)
Answer:
a. the product of the current and the time interval
Explanation:
the basic formula is: 
current means the time rate of flow of charge: 
where Q - charge
I - current
t - time
Answer:
when energy changes from one form to another, it always goes from a more useful to a less useful form. This means that people can't recycle or reuse high quality energy to perform useful work.