Does anyone have the key to " Student Exploration: Uniform Circular Motion" Its a gizmo. Please anyone?

Ideally, the backrest is tilted back slightly, so when you turn the wheel your shoulders are the seat.

Select each of the paced steps below. define the problem. conduct an internet search for information. list the alternatives. select the criteria. evaluate the alternatives. make a decision. evaluate the decision.

How do astronomers measure the amount of dark matter in the universe