- #1
RoboNerd
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Homework Statement
A ball of mass m hangs vertically from a massless string experiencing a tension T. What force is required to pull the ball out to an angle theta from the vertical?
- 1) mgsin(theta)
- 2) mgcos(theta)
- 3) mgtan(theta)
- 4) 2mg tan (theta)
- 5) mg/cos (theta)
Homework Equations
no equations
The Attempt at a Solution
Well, I thought that if we break down the components of gravity acting on an object at an angle theta from the lowest point of it hanging, then we would have a component mg * sin(theta) acting in a direction perpendicular towards the cord [restoring force] and a component mg * cos(theta) acting in a direction antiparallel to the cords tension.
Thus, I would need to apply an equivalent force to mg*sin(theta) in the opposite to counter react the force of gravity's component.
The solutions say that the answer is mg*tan
Well, I thought that if we break down the components of gravity acting on an object at an angle theta from the lowest point of it hanging, then we would have a component mg * sin(theta) acting in a direction perpendicular towards the cord [restoring force] and a component mg * cos(theta) acting in a direction antiparallel to the cords tension.
Thus, I would need to apply [number 3]. Could anyone please explain why their answer is right and why my approach is possibly wrong?