Posted by Sammy on Friday, June 15, 2012 at 5:18pm.
The mass of additional water displaced equals the mass of the rock.
That equals
pi*R^2*2.3 cm^3* 1.00 g/cm^3 = 65.3 grams = 0.0653 kg
For the rock's weight in newtons, multiply that by 9.8.
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