Question

a metal cube weighs 200g in air and 180 g in water. tge volume of metal cube is​

Answer 1

Answer:

volume of metal cube will be 20 cm³

Explanation:

weight of metal cube in air = 200 gms

weight of metal cube in water = 180 gms

=> upthrust = 200 - 180 = 20 gm

The upthrust should be equal to the weight of water displaced,

=> weight of water displaced = 20 gms

volume of water displaced = weight/density = 20/1 = 20 cm³

But volume of water displaced should be equal to volume of the metal cube

Hence volume of metal cube will be 20 cm³

Answer 2

Answer:

20 cm³

Explanation:

We all know that, when any body is pressed in water, an upthrust acts on it and this upthrust is equal to the weight of water displaced.

Here, upthrust = weight in air - weight in water.

                        = 20

Weight of water displaced is 20 gm.

Since density of water is 1gm/cm^3. Therefore, it's volume will be 20 cm^3.

Volume of water displaced will be equal to volume of metal cube.

Volume of metal cube therefore will be 20 cm^3.