hello - the unit plan lists activity by day and then states that it is based on a 45 minute period. Can anyone tell me if this unit plan is assuming a double period for each class?

We're so glad that you're using the materials and finding them useful!  All of our unit plans assume a 40-50 minute class period.  Let us know if you have any other questions!

I am looking at the practice FRQs. Is the answer key to question 2a accurate? A lower θ does not necessarily mean a larger horizontal displacement. (i.e. 30 degrees will have the same horizontal displacement at 60 degrees.) Is there another phrasing for this question that would be appropriate?

Nick, thanks very much for spotting that, you are correct. Please check out the revised posted version, and let me know if that works.  John