D = 8cm H=8cm - Gauthmath
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F = 0.96N.
Explanation: (i)
- The force W acts downwards at the centre of mass of the metre rule, which is at the 50cm mark.
- The force R acts upwards at the pivot point.
(ii) Step 1: The metre rule is in equilibrium, so the sum of the clockwise moments about the pivot is equal to the sum of the anticlockwise moments about the pivot. Step 2: Clockwise moment = W x 40cm. Step 3: Anticlockwise moment = F x 50cm. Step 4: W x 40cm = F x 50cm. Step 5: W = 0.12kg x 10N/kg = 1.2N. Step 6: 1.2N x 40cm = F x 50cm. Step 7: F = (1.2N x 40cm)/50cm = 0.96N.
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