Textbook Question
How many times does a human heart beat during a person's lifetime? How many gallons of blood does it pump?
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Ch 01: Units, Physical Quantities & Vectors
Young & Freedman Calc14th EditionUniversity PhysicsISBN: 9780321973610
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Table of contents
- Ch 01: Units, Physical Quantities & Vectors41
- Ch 02: Motion Along a Straight Line67
- Ch 03: Motion in Two or Three Dimensions47
- Ch 04: Newton's Laws of Motion23
- Ch 05: Applying Newton's Laws59
- Ch 06: Work & Kinetic Energy14
- Ch 07: Potential Energy & Conservation8
- Ch 08: Momentum, Impulse, and Collisions18
- Ch 09: Rotation of Rigid Bodies42
- Ch 10: Dynamics of Rotational Motion48
- Ch 11: Equilibrium & Elasticity27
- Ch 12: Fluid Mechanics31
- Ch 13: Gravitation35
- Ch 14: Periodic Motion32
- Ch 15: Mechanical Waves25
- Ch 16: Sound & Hearing32
- Ch 17: Temperature and Heat36
- Ch 18: Thermal Properties of Matter38
- Ch 19: The First Law of Thermodynamics33
- Ch 20: The Second Law of Thermodynamics22
- Ch 21: Electric Charge and Electric Field36
- Ch 22: Gauss' Law24
- Ch 23: Electric Potential31
- Ch 24: Capacitance and Dielectrics18
- Ch 25: Current, Resistance, and EMF26
- Ch 26: Direct-Current Circuits30
- Ch 27: Magnetic Field and Magnetic Forces18
- Ch 28: Sources of Magnetic Field10
- Ch 29: Electromagnetic Induction28
- Ch 30: Inductance17
- Ch 31: Alternating Current21
- Ch 32: Electromagnetic Waves1
- Ch 33: The Nature and Propagation of Light20
- Ch 34: Geometric Optics34
- Ch 35: Interference19
- Ch 36: Diffraction25
- Ch 37: Special Relativity20
- Ch 38: Photons: Light Waves Behaving as Particles15
- Ch 39: Particles Behaving as Waves26
- Ch 40: Quantum Mechanics I: Wave Functions21
- Ch 41: Quantum Mechanics II: Atomic Structure25
- Ch 42: Molecules and Condensed Matter18
- Ch 43: Nuclear Physics16
- Ch 44: Particle Physics and Cosmology23
Young & Freedman Calc14th EditionUniversity PhysicsISBN: 9780321973610Not the one you use?Change textbook
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Young & Freedman Calc 14th EditionCh 01: Units, Physical Quantities & VectorsProblem 19
Young & Freedman Calc 14th EditionCh 01: Units, Physical Quantities & VectorsProblem 19Chapter 1, Problem 19
How many times does a typical person blink her eyes in a lifetime?
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Estimate the average number of blinks per minute. A typical person blinks about 15 to 20 times per minute.
Calculate the number of blinks per hour by multiplying the average blinks per minute by 60 (the number of minutes in an hour).
Determine the number of blinks per day by multiplying the number of blinks per hour by 24 (the number of hours in a day).
Estimate the average lifespan in years. For example, you might use 80 years as a typical lifespan.
Calculate the total number of blinks in a lifetime by multiplying the number of blinks per day by 365 (days in a year) and then by the estimated lifespan in years.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Average Blink Rate
The average blink rate is the number of times a person blinks per minute. Typically, a person blinks about 15-20 times per minute. This rate can vary based on factors such as environment, fatigue, and health. Understanding this rate is crucial for estimating the total number of blinks over a lifetime.
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Lifetime Duration
Lifetime duration refers to the average lifespan of a person, which is essential for calculating the total number of blinks. In many developed countries, the average lifespan is approximately 80 years. This figure helps in determining the total time over which blinking occurs.
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Time Conversion
Time conversion involves translating years into smaller units like days, hours, and minutes to facilitate calculations. Since blinking is measured per minute, converting a lifetime into minutes is necessary. There are 525,600 minutes in a year, which is used to calculate the total number of blinks over a lifetime.
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Related Practice
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?
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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
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.)
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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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