Getting homework help:
In order to get help on a homework problem, you need to specify the problem to which you are referring. You start with the book abbreviation (see below), then Q for question and P for problem, then the problem number, finally, p### where ### is the page number on which the problem starts. For instance, for the AP Physics book, the first line of your post might be:

Help needed with HRWP24p10 is problem #24 on page 10 of Halliday, Resnick & Walker.

The abbreviations:
Halliday Resnick & Walker = HRW
Understanding Physics = UP
Mooney = M

Some books might not have page numbers in which case you will use the chapter (e.g., C24.12) along with the book's abbreviation. So

PoPC24.12

If we all follow this procedure, I will be able to help you faster and you will be able to search for help on a problem quickly and accurately.

--Dr. G.