A-LevelPhysicsDynamics9702/12 · Oct/Nov 2016 · Q171 Mark
A rigid cross-shaped structure having four arms PO, SO, QO and RO, each 1.00 m long, is pivoted at O. Forces act on the ends of the arms and on the midpoints of the arms as shown. [Figure 17.1] What is the magnitude of the resultant moment on the structure about O?
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A45 Nm
B90 Nm
C120 Nm
D190 Nm
✓ Correct answer
C: 120 Nm
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