Ch 01: Units, Physical Quantities & Vectors

Young & Freedman Calc - University Physics 14th Edition

Young & Freedman Calc14th EditionUniversity PhysicsISBN: 9780321973610Not the one you use?Change textbook

Young & Freedman Calc 14th Edition

Ch 01: Units, Physical Quantities & Vectors

Problem 22

Chapter 1, Problem 22

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 Practice

Textbook Question

For the vectors A and B in Fig. E1.24, use a scale drawing to find the magnitude and direction of the vector difference A − B.

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Textbook Question

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

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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.

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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?

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Textbook Question

For the vectors A and B in Fig. E1.24, use a scale drawing to find the magnitude and direction of the vector sum A + B

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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?

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