7. (8 points) The free body diagram below represents a 1 500 kg car sitting on a

Question

7. (8 points) The free body diagram below represents a 1 500 kg car sitting on a 3 000 kg bridge supported at its far ends. The car's position is three quarters of the length L from the left end of the bridge. Identify the one error in the torque equation below: FL-F 1Eon bridge (L/2)-F Eon Car E ou ca E on bride a. F never produces a torque on the bridge no matter where the axis of rotation is placed. F, never produces a torque on the bridge no matter where the axis of rotation is placed. Ften bridse cannot produce a torque on the bridge no matter where the axis of rotation is taken since it is at the center of the bridge b. c. d. Because the perpendicular distance to F, from the left end of the bridge is 0, FiL should be 0 Because the perpendicular distance to F, from the right end of the bridge is 0, F2L should be 0 e.

Explanation / Answer

as seen from the FBD shown in the image
torque equaiton about the left endf of the bridge will be
F2L - Fe on car*3L/4 - Fe on bridge * L/2 = 0

so the error in the given torque equaiton is the extra term F1*L

so
d. because the perpendicular distance to F1 fomr the left end of the bridge is 0, F1L = 0

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