PH-529
Moments
Physics · Secondary 3 · Hard · Moments
A uniform 1.0 m ruler is balanced on a knife-edge placed 40 cm from one end. A 0.30 N weight is hung from the 10 cm mark to keep it horizontal. What is the weight of the ruler?
- 0.30 N
- 0.60 N
- 0.90 N
- 1.20 N
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