Table of contents

0. Math Review31m
- Math Review
  31m
1. Intro to Physics Units1h 29m
2. 1D Motion / Kinematics3h 56m
3. Vectors2h 43m
4. 2D Kinematics1h 42m
5. Projectile Motion3h 6m
6. Intro to Forces (Dynamics)3h 22m
7. Friction, Inclines, Systems2h 44m
8. Centripetal Forces & Gravitation7h 26m
9. Work & Energy1h 59m
10. Conservation of Energy2h 54m
11. Momentum & Impulse3h 40m
12. Rotational Kinematics2h 59m
13. Rotational Inertia & Energy7h 4m
14. Torque & Rotational Dynamics2h 5m
15. Rotational Equilibrium3h 39m
16. Angular Momentum3h 6m
17. Periodic Motion2h 9m
18. Waves & Sound3h 40m
19. Fluid Mechanics4h 27m
20. Heat and Temperature3h 7m
21. Kinetic Theory of Ideal Gases1h 50m
22. The First Law of Thermodynamics1h 26m
23. The Second Law of Thermodynamics3h 11m
24. Electric Force & Field; Gauss' Law3h 42m
25. Electric Potential1h 51m
26. Capacitors & Dielectrics2h 2m
27. Resistors & DC Circuits3h 8m
28. Magnetic Fields and Forces2h 23m
29. Sources of Magnetic Field2h 30m
30. Induction and Inductance3h 38m
31. Alternating Current2h 37m
32. Electromagnetic Waves2h 14m
33. Geometric Optics2h 57m
34. Wave Optics1h 15m
35. Special Relativity2h 10m

1. Intro to Physics Units

Counting Significant Figures

Physics

1. Intro to Physics Units

Counting Significant Figures

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5:58 minutes

Problem 22

Textbook Question

How many times does a human heart beat during a person's lifetime? How many gallons of blood does it pump?

Verified step by step guidance

Estimate the average number of heartbeats per minute. A typical resting heart rate is about 70 beats per minute.

Calculate the number of heartbeats per year. Multiply the average heartbeats per minute by the number of minutes in an hour, hours in a day, and days in a year. Use the formula:

70 \times 60 \times 24 \times 365

Estimate the average lifespan in years. For example, you might use 80 years as a typical lifespan.

Calculate the total number of heartbeats over a lifetime by multiplying the number of heartbeats per year by the average lifespan. Use the formula:

70 \times 60 \times 24 \times 365 \times 80

Estimate the total gallons of blood pumped. Assume the heart pumps about 1.5 gallons of blood per minute. Multiply the gallons per minute by the number of minutes in a lifetime using the formula:

1.5 \times 60 \times 24 \times 365 \times 80

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Average Heart Rate

The average heart rate is the number of times the heart beats per minute. For adults, this typically ranges from 60 to 100 beats per minute. Understanding this rate is crucial for estimating the total number of heartbeats over a lifetime, as it provides a baseline for calculations.

Lifetime Duration

Lifetime duration refers to the average lifespan of a human, which is essential for calculating the total number of heartbeats and blood pumped. The average human lifespan is approximately 70-80 years, and using this figure allows for a comprehensive estimation of heart activity over a person's life.

Cardiac Output

Cardiac output is the volume of blood the heart pumps per minute, typically around 5 to 6 liters in adults. This concept is vital for determining the total gallons of blood pumped over a lifetime, as it combines heart rate and stroke volume to quantify blood circulation.

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Related Videos

Related Practice

Textbook Question

How many significant figures are there in each of the following values?

75.0

776

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Textbook Question

A useful and easy-to-remember approximate value for the number of seconds in a year is π × 107. Determine the percent error in this approximate value. (There are 365.24 days in one year.)

1208

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Textbook Question

With a wooden ruler, you measure the length of a rectangular piece of sheet metal to be 12 mm. With micrometer calipers, you measure the width of the rectangle to be 5.98 mm. Use the correct number of significant figures: What is the perimeter of the rectangle?

670

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Textbook Question

You are using water to dilute small amounts of chemicals in the laboratory, drop by drop. How many drops of water are in a 1.0-L bottle?

517

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Textbook Question

Four astronauts are in a spherical space station. If, as is typical, each of them breathes about 500 cm³ of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year?

How many times does a typical person blink her eyes in a lifetime?

570

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Textbook Question

How many gallons of gasoline are used in the United States in one day? Assume that there are two cars for every three people, that each car is driven an average of 10,000 miles per year, and that the average car gets 20 miles per gallon.

1331

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Multiple Choice

How many significant figures are in each of the following numbers?
a) 0.0032
b) 10790
c) 08.02

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