Question

The box is made up of iron and it has a volume of 125 cm cube find the mass (density of iron 7.8/cm8)

Answer 1

Answer:

Given that,

Volume of body V=10  

−4

m  

3

 

Density of iron, ρ  

i

​  

=7800kgm  

−3

 

Density of water ρ  

w

​  

=1000kgm  

−3

 

Weight in air,W  

a

​  

=ρ  

i

​  

Vg=7800×10  

−4

×10=7.8N

We know that,

Weight in water = weight in air – buoyancy force

W  

w

​  

=W  

a

​  

−ρ  

w

​  

Vg

W  

w

​  

=7.8−1000×10  

−4

×10

W  

w

​  

=6.8N

Hence, the weight of body in water is 6.8 N