Question

a weight of 30 newton when dipped in in water. find the density of solid is its weight 40 Newton in air​

Answer 1

Answer:

Explanation:

Upward Force =Downward Force

Apparent Weight + Buoyant Force = Actual Weight

30N + Buoyant Force =40N

Buoyant Force = 10N

We know that,

Buoyant Force = the weight of water displaced by the object.

10N = Mass of water*g

Mass of water = 10/g =10/10 = 1 kg

Volume of water displaced = Mass/Density = 1/1 =1 m³

Also,

Weight = Mass*g

Mass of object = w/g = 40/10 = 4 kg

We also know,

Volume of water displaced = Volume of Object

1 = Mass of object/Density of object

Density of object = Mass of object*1

                             = 4 kg/m³