Answer:
Step-by-step explanation:
Alright, lets get started.
Cube exerts a force of 7 newton.
The pressure on the table due to cube is 700 newtons per square meter.
Formula for pressure = [tex]\frac{Force}{Area}[/tex]
Plugging the value of pressure and force, we could find the ara, this is surface area of cube which is in contact with table.
[tex]700=\frac{7}{area}[/tex]
So, area = [tex]\frac{7}{700}=\frac{1}{100}[/tex]
Hence the surface area of side of cube is [tex]\frac{1}{100}[/tex]
Suppose the side of cube is a, then
[tex]a^2=\frac{1}{100}[/tex]
Taking square root on both sides
a=[tex]\frac{1}{10}=0.1[/tex]
Hence the side of cube is 0.1 m
So. volume of cube will be = [tex]a^3=0.1^3=0.001[/tex]
mass=[tex]density*volume[/tex]
Plugging the value of density and volume
mass=[tex]720*0.001=0.72[/tex] kg
Hence the mass of the cube is 0.72 kg. : Answer
Hope it will help :)
