Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 13 - Oscillations About Equilibrium - Problems and Conceptual Exercises - Page 445: 5

Answer

$T=1.23s$, $f=0.813$ Hz

Work Step by Step

Use dimensional analysis to find the time it takes for one heart beat. $$\frac{74 beats}{1min} \times \frac{1min}{60s}=1.23s$$ This is the period. To find frequency, use the formula relating period with frequency, which is $$f=\frac{1}{T}$$ Substituting the known value of $T=1.23s$ yields a frequency of $$f=\frac{1}{1.23s}=0.813Hz$$
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