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 Calc15th EditionUniversity PhysicsISBN: 9780135159552
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Table of contents
- Ch 01: Units, Physical Quantities & Vectors37
- Ch 02: Motion Along a Straight Line57
- Ch 03: Motion in Two or Three Dimensions45
- Ch 04: Newton's Laws of Motion23
- Ch 05: Applying Newton's Laws54
- Ch 06: Work & Kinetic Energy11
- Ch 07: Potential Energy & Conservation6
- Ch 08: Momentum, Impulse, and Collisions15
- Ch 09: Rotation of Rigid Bodies37
- Ch 10: Dynamics of Rotational Motion44
- Ch 11: Equilibrium & Elasticity27
- Ch 12: Fluid Mechanics27
- Ch 13: Gravitation34
- Ch 14: Periodic Motion26
- Ch 15: Mechanical Waves22
- Ch 16: Sound & Hearing28
- Ch 17: Temperature and Heat28
- Ch 18: Thermal Properties of Matter35
- Ch 19: The First Law of Thermodynamics29
- Ch 20: The Second Law of Thermodynamics18
- Ch 21: Electric Charge and Electric Field28
- Ch 22: Gauss' Law21
- Ch 23: Electric Potential31
- Ch 24: Capacitance and Dielectrics18
- Ch 25: Current, Resistance, and EMF24
- Ch 26: Direct-Current Circuits29
- Ch 27: Magnetic Field and Magnetic Forces16
- Ch 28: Sources of Magnetic Field10
- Ch 29: Electromagnetic Induction22
- Ch 30: Inductance14
- Ch 31: Alternating Current20
- Ch 33: The Nature and Propagation of Light17
- Ch 34: Geometric Optics29
- Ch 35: Interference13
- Ch 36: Diffraction19
- Ch 37: Special Relativity19
- Ch 38: Photons: Light Waves Behaving as Particles12
- Ch 39: Particles Behaving as Waves25
- Ch 40: Quantum Mechanics I: Wave Functions20
- Ch 41: Quantum Mechanics II: Atomic Structure21
- Ch 42: Molecules and Condensed Matter17
- Ch 43: Nuclear Physics13
- Ch 44: Particle Physics and Cosmology17
Young & Freedman Calc15th EditionUniversity PhysicsISBN: 9780135159552Not the one you use?Change textbook
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Young & Freedman Calc 15th EditionCh 01: Units, Physical Quantities & VectorsProblem 16
Young & Freedman Calc 15th EditionCh 01: Units, Physical Quantities & VectorsProblem 16Chapter 1, Problem 16
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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Determine the population of the United States. For estimation purposes, you can use a rough figure, such as 330 million people.
Calculate the number of cars in the United States using the ratio provided: two cars for every three people. Use the formula: \( \text{Number of cars} = \frac{2}{3} \times \text{Population} \).
Calculate the total miles driven by all cars in one year. Multiply the number of cars by the average miles driven per car per year: \( \text{Total miles per year} = \text{Number of cars} \times 10,000 \).
Determine the total gallons of gasoline used in one year by dividing the total miles driven by the average miles per gallon: \( \text{Total gallons per year} = \frac{\text{Total miles per year}}{20} \).
Convert the total gallons used per year to gallons used per day by dividing by the number of days in a year: \( \text{Gallons per day} = \frac{\text{Total gallons per year}}{365} \).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Unit Conversion
Unit conversion is essential for translating measurements into different units, such as converting miles driven per year into gallons of gasoline used. This involves understanding and applying conversion factors, like miles per gallon, to calculate the total gasoline consumption accurately.
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Unit Conversions
Average Calculation
Calculating averages is crucial for estimating typical values in a given context, such as the average number of miles driven per car annually. This concept helps in determining the overall gasoline usage by considering typical driving patterns and fuel efficiency.
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Population Estimation
Population estimation involves determining the number of entities, such as cars, based on demographic data. In this scenario, estimating the number of cars from the population size is necessary to calculate total gasoline consumption, using the ratio of cars to people.
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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 area of the rectangle?
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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?
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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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