D=M/V
If you mean the mass is 5 grams then:
V=10 x 4 x 2
V=80cm^3
D=5/80
D=.0625 g/cm^3
If you mean the block WEIGHS 5 grams then:
M=Weight/9.8=.51
V=80 cm^3
D=.51/80
D=.006375 g/cm^3
It is the mass of the block divided by its volume.
You need its mass and volume.
Volume
that is not a mathematical question, you have to know what its made of.
A cuboid or a rectangular prism.
It is the mass of the block divided by its volume.
You need its mass and volume.
Volume
on a balance
A triple-beam balance can be used. The units could be g/ml the density of a normal wood is 0.88 but a wood block in density can be anything under 1 so it can be 0.95,0.54,etc. waters density is 1 and would can float on water so wood is anything below 1.
.83 g/ml
that is not a mathematical question, you have to know what its made of.
On average, a limestone block weighs around 150 pounds (68 kg). However, the weight can vary based on the size and density of the specific block.
The volume of the block is (3 x 3 x 3) = 27 cubic cm. In order to find its density, you also have to know its mass. When you have that, divide it by 27 cm3, and the answer is the density.
A cube, with 3cm sides, has a volume of 3x3x3 = 27cc The weight is 27grammes. Density = weight / volume = 27g / 27cc = 1g/cc = 1000Kg/M3 A relative density of 1.0 (same as water)
Plinth
column