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You need the area to find the volume of an object.
Mass = Pressure*Area
There are basically two techniques for finding the area of a shape with uneven or irregularly shaped sides. If the sides can be described by algebraic equations, then integral calculus can be used to find the area. Failing that, you can approximate the irregular shape by fitting in a number of smaller, regularly shaped polygons such as squares and triangles, whose area can be calculated by simple geometric techniques.
Pi x radius2 x height
you get a calculator and learn the correct formula
The answer depends on what information you do have about the object.
the volumn of water being displaced by the object as it pushes the water up equal to the volumn of the irrgulary shaped object. As long as such irrgulary shaped object doesn't absort the water such as sponge.
Take an amount of water of which you know the volume. Drop the object in the water. Find the difference
whats the object
To calculate the density of an irregular shaped floating object, you can measure its mass using a balance and then find its volume by submerging it in a known volume of water and measuring the water displaced. For a regular shaped floating object, you can simply divide its mass by its volume to find the density.
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You can find the volume of an irregularly shaped object, like a rock, by using the water displacement method. Submerge the object in a known volume of water in a container. Measure the increase in water level, which equals the volume of the rock.
To find the area of a object you do width x highth for a rectangle. You multiply on side of the object 4 times to get the area of a square. To find the area of a trapizoid, the formula is, 1/2 times highth (base 1 plus base 2).
water displacement
lenght x weight x height
To find the density of a regular shaped object, you can calculate it by dividing the mass of the object by its volume. For irregular shaped objects, you would measure the mass of the object using a scale, then measure its displaced water volume when submerged in a graduated cylinder. The density can then be calculated by dividing the mass by the volume of water displaced.