Find the work done in lifting a stone of mass 10 kg and specific gravity 3 from the bed of a lake to a height of 6 m in water.

Find the work done in lifting a stone of mass 10 kg and specific gravi

1.	Find the work done in lifting a stone of mass 10 kg and specific gravity 3 from the bed of a lake to a height of 6 m in water.
Answer» Solution :MASS of STONE = 10kg, SPECIFIC gravity = `(d_(s))/(d_(W)) = 3` `"W=mgh"(1-(d_(w))/(d_(s)))=10xx9.8xx6xx(1-(1)/(3))` `W=98xx6xx(2)/(3)=392j`