Need help with Parts B and D. B) how to find the torque right and torque of plan
ID: 2295942 • Letter: N
Question
Need help with Parts B and D.
B) how to find the torque right and torque of plank?
D) Fleft = N
Fright= N
Use the exact values you enter in previous answer(s) to make later calculation(s). A uniform wooden plank of mass 11 kg rests on two supports as shown in the figure below. The plank is at rest, so it is in translational equilibrium and rotational equilibrium. (Let L1 = 1.8 m, L2 = 7.1 m, and L3 = 2.9 m.) Make a sketch showing all the forces on the plank. Be sure to show where the forces act. Choose the left-hand support for the pivot point and calculate the magnitude of torque from each of the forces in Express the conditions for translational and rotational equilibrium. (Use the following as necessary: FR for the force supplied by the right support, FP for the force supplied by the plank, FL for the force supplied by the left support, tau R for the torque due to the right support, tau p for the torque due to the plank, and tau L for the torque due to the left support. Indicate the direction with the sign of your answer.) Solve to find the magnitudes of the forces exerted by the two supports on the plank.Explanation / Answer
Sketch a diagram of the plank.
____________|/___________
|________________________|
/|-------------------------------------...
F(left)--------------L----------------F(...
a) The forces are: left and right reaction forces from each
support and the plank weight.
b) Length not specified in question! Assume plank length: L
Rotational equilibrium condition: ?T = 0
F(right)L - 11(9.8)(L/2)(L/2) = 0
c) Equilibrium conditions: ?T = 0, ?F = 0
d) ?F = 0, => F(left) + F(right) = 11(9.8) = 107.8 N
therefore, F(left) = F(right) = 107.8/2 = 53.9 N