Assume biological substances are 90 percent water and the density of water is 1.0 ✕ 103 kg/m3.
(a) Estimate the mass of a spherical cell with a diameter of 2.50 µm (volume = 4/3 π r3)
(b) Estimate the mass of a fly, which can be approximated by a cylinder 3.40 mm long by 1.70 mm in diameter (volume = L π r2)
answers should be in Kg
