See Sheet 12 and replace the box at the bottom with the ball, held in orbit by the Centripetal Force which is the vector sum of the tension in the string and the gravitational force at the bottom of the circle. Write down this vector equation paying attention to the relative signs of the vectors. The apparent weight is the force of the support on the object, the tension in the string. Take the direction of the centripetal force as positive. Solve for the speed.
3 comments:
So it's supposed to be mv^2/r right? just by itself?
derived from....
mv^2/r + mg = mg... cancel out the mg's....
did that and got the problem wrong...?
Fc is the vector sum of T and Force of Gravity (mg). It's given in the hint. You should be able to get the answer from this (I don't want to give you too much sorry)
once centripetal force is found, what formula do you use?
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