Quote:
Originally Posted by Rachel Lim
Part 2:
I calculated the torque produced by gravity around point G, and the torque from tension around point E. I then subtracted the two values to find the overall torque.
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You have to pick
one point, and sum all the external torques around
that one point, and
set that sum equal to zero. Then solve.
If you pick the point carefully, the equation will have only one variable, so you can solve for it.
Quote:
torque_gravity = (m*g)(distance_AG)(angle_AG to vertical)
= 15582*1.2*sin(20deg)
= 6395
torque_tension = (T)(distance_AE)(angle AE to ET)
= 5448*1.7*sin(140deg)
= 5953
So the overall torque around point A is 442 N*m in the counterclockwise direction.
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Gravity and cable tension are not the only forces producing torques around point A.
What other external force(s) is(are) acting on the bucket+rollers+ore free body?
Mentors, Teachers, etc: Rachel is a very bright student. Let's give her (and any other students who may be following the thread) a chance to solve the problem.