# College Physics Problem 1.35

## Solution:

### Part 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

$\displaystyle \frac{10^{-2}}{10\left(10^{-15}\right)}=10^{12}\:\text{cells}$

### Part b

The mass of a person is 102 kg.

$\displaystyle \frac{10^2}{10\left(10^{-15}\right)}=10^{16}\:\text{cells}$