Question

s block of wood of density 0.5 g cm cube has o volume of 60 cm cube.the mass of the block is 48 g find its relative density
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Answer 1

Block.............

The levelling of ploughed soil is beneficial because : The levelling of ploughed fields prevents the top fertile soil from being carried away by strong winds or washed away by rain water. The levelling of ploughed fields helps in the uniform distribution of water in the fields during irrigation.

Answer 2

Answer:

According to Archimedes' principle.

Mass of volume displaced is by object is buoyancy force.

Let the volume of wood is V.

then the volume submerged in liquid is V/4

let the density of wood be ρ.

let the density of liquid be ρ

l

=0.8cm

−3

.

weight of wood ρVg.

buoyancy force =

4

ρ

l

V

g

now weight of block is equal to buoyancy force.

ρVg=

4

ρ

l

V

g

So ρ=

4

0.8

=.2gcm

−3

then the volume submerged in oil is 60% of is 3V/5

weight of wood ρVg

buoyancy force =

5

ρ

oil

3V

g

now weight of block is equal to buoyancy force.

ρVg=

5

ρ

oil

3V

g

So ρ

oil

=

3

ρ×5

=

3

0.2×5

=0.33gcm

−3