Review centre of gravity calculation

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The discussion focuses on calculating the center of gravity (CG) for a half octagonal prism with a small weight placed at a specific distance from the centerline. Participants emphasize the importance of accurately determining centroids for individual shapes (trapezoid and rectangle) and ensuring consistent reference points for calculations. Issues arise regarding the inclusion of the prism's bottom surface and the need to consider the mass distribution of all components when calculating the overall CG. Clarifications are made about using correct equations and the significance of area in determining moments. The conversation highlights the necessity of precise calculations to confirm the vessel's stability during inclining tests.
  • #31
Wait, I think I have it figured out now. Let me correct this and get back to you
 
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  • #32
Samiha Samin said:
Wait, I think I have it figured out now. Let me correct this and get back to you

When you do your calculations of vessel KG, remember to include not only the inclining weight, but all the gear (scales, plumb bob, mast holding the plumb bob, etc.) with which the model vessel is fitted to carry out the inclining experiment. The experiment gives the KG of the vessel as inclined, and the weight and KG of the vessel by itself must be found by removing the items used to carry out the experiment, by doing a separate calculation of their weights and KGs and subtracting from the inclined condition.
 
  • #33
SteamKing said:
When you do your calculations of vessel KG, remember to include not only the inclining weight, but all the gear (scales, plumb bob, mast holding the plumb bob, etc.) with which the model vessel is fitted to carry out the inclining experiment. The experiment gives the KG of the vessel as inclined, and the weight and KG of the vessel by itself must be found by removing the items used to carry out the experiment, by doing a separate calculation of their weights and KGs and subtracting from the inclined condition.
Okay I have found the masses of each individual parts, but when I add them up it is not equal to the mass of the whole vessel that I measured on a weighing scale. In fact it sums up to a mass that is greater than the mass of the whole vessel. Does this indicate an error in my calculation?
 
  • #34
Samiha Samin said:
Okay I have found the masses of each individual parts, but when I add them up it is not equal to the mass of the whole vessel that I measured on a weighing scale. In fact it sums up to a mass that is greater than the mass of the whole vessel. Does this indicate an error in my calculation?
Yes, I'm afraid it could.

Just out of curiosity, how much did the vessel weigh on the scale, and how much is your calculated weight?

Did you weight the vessel with or without all of the inclining experiment gear attached?
 

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