Answer to Question #325213 in Mechanics | Relativity for kentblue

Question #325213

A piece of metal has a mass of 200 g in air and 170 g when immersed in water. Calculate its volume and density. [Density of water is 1000 kgm-3. Take g=9.8 ms-2 ]

1
Expert's answer
2022-04-07T13:09:57-0400

The weight of a piece of metal in water

Wwater=WairgρwaterVW_{water}=W_{air}-g\rho_{water}V

Hence, the volume of an object

V=WairWwatergρwater=0.200.171000=3105m3V=\frac{W_{air}-W_{water}}{g\rho_{water}}=\frac{0.20-0.17}{1000}=3*10^{-5}\:\rm m^3

The density of object

ρ=mV=0.20kg3105m3=6700kg/m3\rho=\frac{m}{V}=\frac{0.20\:\rm kg}{3*10^{-5}\:\rm m^3}=6700\:\rm kg/m^3


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