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The center of gravity of the truck
The center of gravity of the truck
The position of an object has no effect on the location of its center of gravity. It may have an effect on the truck's center of gravity, however, if the truck's load shifts on the incline. But that's the result of an actual shift in the center of gravity, not the result of the incline.
A lorry does
You can use plumb lines to find the center of gravity of an object.
How do you find centre of gravity of a vehicle?
being a maintained center of gravity
In both cases, because of their symmetry, the center of gravity is in the geometric center.
For two point masses of equal mass, the center of gravity is the center of mass and is located midway between the two point masses.
It is best to keep the center of gravity low on any road vehicle. This can be done by design, and by loading the heaviest items lowest with lighter items higher up. So to answer your question, they need as low a center of gravity as is physically possible.
You can use plumb lines to find its center of gravity. Hold it from one point and draw vertical line in direction of gravity (plumb line). Hold it from another point and do the same, and a third point if necessary; where the lines cross is center of gravity
Because its liquid and needs to allow gravity to drain to the center and bottom of the tank