The pdf and odt labels are switched. I clicked on the pdf and it was an odt and vice versa.

Thanks for letting us know. It is now corrected.

I have a question for #2d on the FRQ with the conical pendulum.   If you end up doubling the speed right before the string breaks, doesn't that have and effect on the radius of the circle as well as the angle it makes to the vertical (actually making it swing higher into the air than previous) so the vertical height is actually bigger so the time in the air would also be bigger?   This would cause it to fall in the air longer?   Or is the question suggestion that length of the string changes to cancel out the changes in the radius and angle to get an increase in speed without changing the height?

Desiree, thank you for pointing this out, you are correct. It is assumed that the length of the string remains constant. The question has been rewritten to just ask if the student was correct in predicting that it would go farther. John

On #6c, how are the students supposed to know that the radius is 0.1m? It is not included in the question, and I don't see how they would solve for it.

Emily, thank you for pointing this out, you are of course, correct. I added the r = 0.1 m to the problem statement and uploaded it. Thanks!  John