3. Determination of density of regular solids and determination of density of regular solids and determination of density of irregular solids
Answers
Explanation:
Density of regular Solids
When you're asked to calculate density, you need to use a combination of the density equation we've already introduced and an understanding of volume. For example, you might not be given the actual volume of the material or object to put into the density equation. Instead, you may be given the measurements of the object and be expected to figure out the volume yourself.
The volume of a cube or cuboid is length times width times height (L * W * H). So if you needed to calculate the density of a cube, you would first measure the length of one of the sides. Let's say that the length of our cube turned out to be 3 meters. You would first need to calculate the volume by multiplying 3 by 3 by 3 (V = 3 * 3 * 3). You would also need to put the cube on a scale to measure its mass. Last of all, you would divide your volume by your mass to get the density of the cube (p = m / v).
Density of irregular Solids
Question
The density of something is just the mass divided by the volume: D = m/V. The mass you can measure on a balance or a scale, and the volume is the amount of space the object occupies. ...
Answer
As described in the previous question the density is given by D = M/V. If you don't know V then you have to compare the density of the unknown to that of a known density, e.g. water.
Call the density of the object Do and the density of water Dwater. The weight of the object in air is then Mair = Do * V. The weight of the object in water is Mwater = (Do - Dwater) * V.
Dividing one equation by the other the volume V cancels out and the ratio of the two measurements is Mair/Mwater = Do/(Do - Dwater). Using the value of Dwater as 1 gram per cubic centimeter you can easily solve this equation for the density of the object
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