Question

a solid weighs 2.10 gram and its relative density is 8.4. how much the body weigh if it is in
a)water
b)in liquid of relative density 1.2

Answer 1

Mass = 2.1 g

Let vol. = v

2.1/v = density

density of object/density of water = 8.4

density of object = 8.4 g/cc

2.1/v = 8.4

v = 0.25 cc = 2.5*10^-7 m³

The object will sink as its denser than water.

Upthrust = Vol. of displaced water

               = 2.5*10^-7 Newton

Weight = (0.0021)*10

            = 0.021 Newton

Weight in water = 5.25 * 10^-9 Newton

Hope this helps!!!