College Physics Problem 1.29

How many heartbeats are there in a lifetime?

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The general assumptions:

  • There is 1 heartbeat in 1 second
  • In half a lifetime, there are 10^{9} seconds.

Therefore, in a lifetime, the number of heartbeats is

1 lifetime times frac{10^{9}}{0.5  lifetime} times frac{1 heartbeat}{1 s}=2times10^{9} heartbeats

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