How to Calculate Tension in a String for a Conical Pendulum?

[jamesy_81]

Homework Statement

Calculate the tension in a 3m string attached to a 3kg bob that is moving in horizontal circles of a 0.6m radius

Homework Equations

The only formula i have been able to find is tension = mass1 w2 with w2 being the circumfance but this does not that into account gravity or the length of the string

The Attempt at a Solution

i know the circumfance is .6 x 2 x pie which is 3.7692 but should this figure be timesed by gravity? I've spent 2 hours looking for other formulas but have had no luck. Excuse the less than great english. I am not so much after an answer but a way of getting there

Thanks

 

[rad10k]

Hi ,

Hints
1. Only the mass of the object needs to be multiplied by gravity to get its "weight" g = 9.81ms^2

2. You need be using COS + SIN of the angles made by the conical pendulum .