91影视

One shake equal ${}^{{\mathbf{10}}^{\mathbf{-}\mathbf{8}}}$.

Humans have existed for about ${}^{{\mathbf{10}}^{\mathbf{6}\mathbf{}}\mathbf{years}}$.

The universe is about ${}^{{\mathbf{10}}^{\mathbf{10}}\mathbf{}\mathbf{years}}$old

The density of water is${}^{\mathbf{1}\mathbf{.}\mathbf{0}\mathbf{脳}{\mathbf{10}}^{\mathbf{3}\mathbf{}}\mathbf{kg}\mathbf{/}{\mathbf{m}}^{\mathbf{3}}}$.

Unit conversion is the conversion between different units of measure for the same quantity. Use the conversion factors to convert the number of shakes in the year and compare it with the number of seconds in the year.

The number of shakes in a second is${}^{{\mathbf{10}}^{\mathbf{8}}}$.

The number of seconds in years is,

$\mathbf{365}\mathbf{.}\mathbf{25}\mathbf{}\frac{\mathbf{day}}{\mathbf{year}}\mathbf{脳}\mathbf{24}\frac{\mathbf{hrs}}{\mathbf{day}}\mathbf{脳}\mathbf{60}\frac{\mathbf{min}}{\mathbf{hrs}}\mathbf{脳}\mathbf{60}\frac{\mathbf{sec}}{\mathbf{mins}}\mathbf{=}\mathbf{3}\mathbf{.}\mathbf{15}\mathbf{脳}{\mathbf{10}}^{\mathbf{7}}\mathbf{}\mathbf{sec}$

Thus, there are more shakes per second than seconds per year.

The age of the universe is,

$\mathbf{1}\mathbf{}\mathbf{u}\mathbf{鈥�}\mathbf{day}\mathbf{}\mathbf{=}\mathbf{}\mathbf{86400}\mathbf{}\mathbf{u}\mathbf{鈥�}\mathbf{sec}$

The time duration ${}^{\mathbf{螖}\mathbf{t}}$for which humans have existed is calculated as:

localid="1654675551338" $$\begin{gathered} \mathbf{螖迟}\mathbf{=}\frac{{\mathbf{10}}^{\mathbf{6}}}{{\mathbf{10}}^{\mathbf{10}}}\mathbf{}\mathbf{u}\mathbf{鈥�}\mathbf{day} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}{\mathbf{10}}^{\mathbf{-}\mathbf{4}}\mathbf{}\mathbf{u}\mathbf{鈥�}\mathbf{day} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}{\mathbf{10}}^{\mathbf{-}\mathbf{4}}\mathbf{}\mathbf{u}\mathbf{鈥�}\mathbf{day}\mathbf{脳}\frac{\mathbf{86400}\mathbf{}\mathbf{u}\mathbf{-}\mathbf{sec}}{\mathbf{1}\mathbf{}\mathbf{u}\mathbf{鈥�}\mathbf{day}} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{8}\mathbf{.}\mathbf{6}\mathbf{}\mathbf{u}\mathbf{鈥�}\mathbf{sec} \end{gathered}$$

Thus, the time duration for which humans have existed is${}^{\mathbf{8}\mathbf{.}\mathbf{6}\mathbf{}\mathbf{u}\mathbf{鈥�}\mathbf{sec}}$.