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Worked Examples-Calculation Part 1-Archimedes Principle

Considered Formula;

i)Up=WaWl Where  UpUpthrust,WaWeight in airWlWeight in liquid ii)R.D=WaWaWl Where  R.DRelative Density,WaWeight in airWlWeight in liquid

Example 1

A block of iron weighs 20 N in air and 17 N when completely immersed in water. Calculate the Upthrust exerted by water

Solution

Weight in air (Wa) = 20 N
Weight in water (Ww) = 17 N
Upthrust (Up) = ?
Up=WaWw  =(2017)N  =3N

The Upthrust exerted by water = 3 N

Example 2

A body weighs 0.36 N in air and 0.18 N when immersed in water. Find the

i)        Upthrust exerted by water

ii)       Relative density of a body

Solution

Data given

Weight in air (Wa)  = 0.36 N

Weight in water (Ww) = 0.18 N

i)        Upthrust (Up) =?


Up=WaWw  =(0.360.18)N  =0.18N

The Upthrust exerted by water = 0.18 N

ii)        Relative density (R.D) =?

R.D=WaWaWw         =0.360.360.18         =0.360.18         =2

The The Relative density of a body = 2 N

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