go tothe torque calculation site. http://physics.bu.edu/~duffy/HTML5/torque_three_ways.html

Assume the rod is 100cm in length. Without change any parameters, use the numbers given in the simulation, calculate

1. Lever arm length for the force (blue) applied (directly read from simulation):

[answer]

1. Lever arm length for the weight of the rod:

[answer]

1. Calculate the force (Blue) applied to maintain the equilibrium of the rod.

Now adjust the "String Angle to Vertical: to 45 degree, use the numbers given in the simulation

[answer]

1. Lever arm length for the force (blue) applied:(hint: just ignore the negative sign for the angle)

[answer]

1. Click the method 3 "lever arm" to check your calculation.

[answer]

1. Lever arm length for the weight of the rod:

[answer]

1. Calculate the force (Blue) applied to maintain the equilibrium of the rod.

[answer]

1. Click the method 2 "force component" Find the vertical and horizontal component of the force.

[answer]

1. Notice that there is force (red) at the hinge, since the rod is in equilibrium (total net force = 0, net torque=0), calculate the force at the hinge.

Horizontal component:

[answer]

Vertical component:

[answer]

Total magnitude of the force:

[answer]