College Physics Problem 1.35

(a) Calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium.
(b) Making the same assumption, how many cells are there in a human?


a) The mass of a hummingbird is 10^{-2} kg, while the mass of a cell is 10^{-15} kg. The number of cells in the hummingbird is

frac{10^{-2}}{10times10^{-15}}=10^{12} cells

b) The mass of a person is 10^{2} kg.

frac{10^{2} kg}{10times10^{-15}}=10^{16} cells