Physics Lab 2: Balancing Centripetal Force. 1. I got the following: 0.25m - 6.42s. 0.40m - 7.78s. 0.15m - 5.09s.

To get "Period" is T= 2Rv. Is this correct? I got 2(0.25)(6.42) = 10.08. If in correct, can you explain what I need to fix. 2. To get "Percent Error" is F=mv2/r correct? Im not sure where to get the numbers from? Example: mass and velocity. How do I insert this formula with the numbers I need? 3. "Expected Value" - How do i find the square of its linear velocity, v² ? Then multiple this value by its mass? How do I get that number? Then I divide everything by the radius, which would be 0.25 for the first problem correct?

I wish I can chat back and forth with the same tutor but im not sure how to do that so I don't have to keep doing it this way. Thank you!