Question

the weight of the body in water is 1/3 weight in air .find density

Answer 1

Weight in air = n
Weight in water = 1/3n
upthrust by water = loss of weight of body in water
= n-1/3n = 2n/3
Upthrust = Vdg = V×d10
Upthrust = 10Vd
2n÷3÷10V = d
2n/3÷10 = d
d = n/15v