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I am not sure what the point is for you to give us the dimensions of a rectangle and then ask what one of those dimensions is. Perhaps you are not sure whether the shorter or the longer of the two dimensions would be considered the length, and which the width. I would say that a rectangle measuring 2cm x 5cm is 2cm wide and 5cm long.
180cm3
The volume is 3cm * 2cm * 5cm = 30 cm3. The density will depend on the mass of the prism which will depend on the material that the prism is made from.
5cm by 7cm by 12cm
30 ( cm x cm )
Density = Mass/Volume, in this case 300/200 so is 1.5 gm per cc
The volume of the 5cm cube of balsa wood is 125cm³ (5cm x 5cm x 5cm). Using the density of 0.2g/cm³, we can calculate the mass by multiplying the volume by the density: 125cm³ x 0.2g/cm³ = 25g. Therefore, the mass of a 5cm³ cube of balsa wood is 25g.
I am not sure what the point is for you to give us the dimensions of a rectangle and then ask what one of those dimensions is. Perhaps you are not sure whether the shorter or the longer of the two dimensions would be considered the length, and which the width. I would say that a rectangle measuring 2cm x 5cm is 2cm wide and 5cm long.
180cm3
The volume is 3cm * 2cm * 5cm = 30 cm3. The density will depend on the mass of the prism which will depend on the material that the prism is made from.
coz
20cm x 20cm x 5cm
4cm x 5cm
The new dimensions are 4cm and 7cm
This is impossible to answer as it depends on the density of the material. I.e. a 125 cm3 of lead is significantly heavier than a 125 cm3 cube of foam rubber.
using length x width x height, I believe it would be 10cm if the dimensions are in that order
5cm by 7cm by 12cm