Can someone let me know the steps i should take please

Question

The volume of a body is 5m³ and the specific gravity is 1.5. What is the weight of the body?

Answer 1

V = volume

SG = specific gravity

W = weight

 

V = 5m³

SG = 1.5

 

First we need to find the specific weight.  Then we multiply that result by the volume.

 

γ = ρg

 

where:

ρ = density

g = 9.81 m/s²

 

ρ = SG * 1000 kg/m³

ρ = 1.5 *1000 kg/m³

ρ =1500 kg/m³

 

Plug this into γ.

 

γ = ρg

γ = (1500 kg/m³) (9.81 m/s²)

γ = 14715 kg/m² s²

 

W = γ V

W = (14715 kg/m² s²)(5 m³)

W = 73575 kg m /s²

 

 

These are the steps you will take.

 

 

 

Answer 2

 

specific gravity =Density of unknown fluid/ density of water

 

The density of water is 1000 kg/m^3

 

So the density of the fluid is 1500 kg/m^3

 

From here we can do simple unit analysis kg/m^3* m^3 is just kg but this is a mass not a weight

 

To get it into weight we multiply by gravity so the answer is

 

Weight=density*volume*gravity