Q29PE - College Physics (Urone)

Question

How many heartbeats are there in a lifetime?

Step-by-Step Solution

Answer

The heartbeats in a lifetime is \(3.322 \times {10^9}{\rm{ beats}}\). 

Step 1: Average life:

The average life of a person according to the world health organization \({\bf{2015}}\)report is \({\rm{79 years}}\). 

Step 2: conversion of units:

Conversion of \({\rm{79 years}}\) into minutes.

\(\begin{array}{c}{\rm{79 years}} = {\rm{79 years}} \times \frac{{365{\rm{ days}}}}{{1{\rm{ year}}}}\\ = \left( {{\rm{79}} \times 365} \right){\rm{ days}} \times \left( {\frac{{24{\rm{ hr}}}}{{1{\rm{ day}}}}} \right)\\ = \left( {{\rm{79}} \times 365 \times 24} \right){\rm{ hr}} \times \left( {\frac{{{\rm{60 min}}}}{{1{\rm{ hr}}}}} \right)\\ = 41522400{\rm{ min}}\end{array}\)

Step 3: The heartbeats in a lifetime:

A heart beats in a minute is \(80\) times. Therefore in \({\rm{79 years}}\), it will beat,

\(\begin{array}{c}{\rm{Heart beats}} = 41522400{\rm{ min}} \times {\rm{80 }}{{{\rm{beats}}} \mathord{\left/ {\vphantom {{{\rm{beats}}} {{\rm{min}}}}} \right.} {{\rm{min}}}}\\ = 3.322 \times {10^9}{\rm{ beats}}\end{array}\)

 

Hence, the heartbeats in a lifetime is \(3.322 \times {10^9}{\rm{ beats}}\).