Urban fantasies whose authors understand physics?

[Cheesegear]

What I'm interested in is the idea of using magic to create a nonmagical object or effect which then takes advantage of known science to achieve the desired result.

Yes. I know you meant. That is what happens.

Or the use of the author's physics knowledge to predict unintended or intended consequences and side effects of magical goings-on.

Yes. I know you meant. That is what happens.