Question

state the archimedes principal? write two applications .why a block of plastic does released under water come up to surface of water ​

Answer 1

ARCHIMEDES PRINCIPAL:

Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid.

APPLICATION OF ARCHIMEDES PRINCIPLES:

Archimedes' principle is also used in designing ships and submarines. The floating of a big ship is based on the Archimedes' principle.

why a block of plastic does released under water come up to surface of water ?

ANSWER:The density of plastic is less than that of water, so the force of buoyancy on plastic block will be greater than the weight of plastic block displaced. Hence, the acceleration of plastic block will be in upward direction, and comes up to the surface of water.

Answer 2

Answer:

Volume of part of wooden block immersed in water V

in

=(40×40×5) cm

2

=(40×40×5) ×10

−6

m

3

Density of water σ

w

=10

3

kg/m

3

Weight of wooden block = Weight of water displaced

Mg=V

in

σ

w

g

Mg=(40×40×5)×10

−6

×10

3

g

⇒M=8 kg