February 27, 2017

Homework Help: Lab for physics

Posted by RSVP on Sunday, September 30, 2007 at 11:40am.

K, so we are doing this lab in physics where a ball on a string is put through a glass tube and then different washers (masses) are added to the string. A radius is measured out, and then the string is spun in a horizontal with different radii and different masses, at different points of the lab. Anyways, I have all of my data, which is mass, rotation, and time..then this question asks us to calcualte the gravitational force, and it says that the centripetal fore will be the same as the gravitationla force...this leads to a problem...we are also asked to calculate frequeny and frequency squared, but this after the first calculation, but I did it first...then used the f^2 to find centripetal force..and I then found graviatationl force using f=mg....the values don't why are the two calculations the same, and how do u calculate the gravitational force with the information I have (before the frequency) and why is it the same as the centripetal force?

Thanks, sorry this is long! I like to understand what I am doing!

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