Considered Formula;
i)Up=Wa−Wl Where Up→Upthrust,Wa→Weight in airWl→Weight in liquid ii)R.D=WaWa−Wl Where R.D→Relative Density,Wa→Weight in airWl→Weight in liquidExample 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=Wa−Ww
=(20−17)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) =?
The Upthrust exerted by water = 0.18 N
ii)
Relative density (R.D)
=?
The The Relative density of a body = 2 N
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