Calculating Relativistic Mass of Rotating Object

AI Thread Summary
To calculate the relativistic mass of a rotating object, the key variables are the circumference of the object's path, the weight of the object, and its revolutions per minute. The centripetal force required to maintain the object's circular motion can be derived from these variables, particularly focusing on the tension in the string. While the discussion references a conical pendulum for context, the user seeks a simplified equation without considering gravity or air resistance. Understanding the relationship between these variables is essential for determining the effective weight exerted by the spinning rock. A clear equation incorporating these factors will provide the necessary outcome.
Smelly Eggs
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Hi.

I need to find the mass (relativistic mass?) Of an object in rotation.

Say I have a string with a small rock tied to the end.

The relevant variables are:

A) The circumference of the weights path.

B) The weight of the rock itself.

C) The revolutions per minute that B travels around A.

Now, what is the equation needed to put these together to tell me how much 'weight' in kg the spinning rock will exert or pull on the string? Or in other words, how do we know the amount of centripetal force (In kg) the string requires to hold to the spinning rock?
 
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Yes, that's exactly what I'm talking about!

The only thing is I don't know any physics so I don't understand those equations... I just want to know where to put the 3 variables I mentioned to get the outcome I mentioned.

Don't need to know any vertical gravity components or anything like that... just the 3 I menttioned, without concern for gravity or air resistance etc.

Cammon... this should be pretty simple for you physics guys!:-p
 

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