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Every year the Earth travels about 10⁹ km as it orbits the Sun. What is Earth's average speed in km/h?
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Ch. 02 - Describing Motion: Kinematics in One Dimension
Giancoli Douglas5th editionPhysics for Scientists and EngineersISBN: 9780137488179
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TOC.tableOfContents
- Ch. 01 - Introduction, Measurement, Estimating10
- Ch. 02 - Describing Motion: Kinematics in One Dimension30
- Ch. 03 - Kinematics in Two or Three Dimensions; Vectors15
- Ch. 04 - Dynamics: Newton's Laws of Motion16
- Ch. 05 - Using Newton's Laws: Friction, Circular Motion, Drag Forces22
- Ch. 06 - Gravitation and Newton's Synthesis10
- Ch. 07 - Work and Energy21
- Ch. 08 - Conservation of Energy33
- Ch. 09 - Linear Momentum26
- Ch. 10 - Rotational Motion41
- Ch. 11 - Angular Momentum; General Rotation27
- Ch. 12 - Static Equilibrium; Elasticity and Fracture27
- Ch. 13 - Fluids28
- Ch. 14 - Oscillations14
- Ch. 15 - Wave Motion35
- Ch. 16 - Sound5
- Ch. 17 - Temperature, Thermal Expansion, and the Ideal Gas Law40
- Ch. 18 - Kinetic Theory of Gases18
- Ch. 19 - Heat and the First Law of Thermodynamics31
- Ch. 20 - Second Law of Thermodynamics32
- Ch. 21 - Electric Charge and Electric Field7
- Ch. 23 - Electric Potential20
- Ch. 24 - Capacitance, Dielectrics, Electric Energy, Storage15
- Ch. 25 - Electric Current and Resistance32
- Ch. 26 - DC Circuits22
- Ch. 27 - Magnetism21
- Ch. 28 - Sources of Magnetic Field24
- Ch. 29 - Electromagnetic Induction and Faraday's Law21
- Ch. 30 - Inductance, Electromagnetic Oscillations, and AC Circuits42
- Ch. 31 - Maxwell's Equations and Electromagnetic Waves25
- Ch. 32 - Light: Reflection and Refraction42
- Ch. 33 - Lenses and Optical Instruments21
- Ch. 34 - The Wave Nature of Light: Interference and Polarization26
- Ch. 35 - Diffraction24
- Ch. 36 - The Special Theory of Relativity29
- Ch. 38 - Quantum Mechanics1
- Ch. 40 - Molecules and Solids6
- Ch. 43 - Elementary Particles3
- Ch. 44 - Astrophysics and Cosmology9
Giancoli Douglas5th editionPhysics for Scientists and EngineersISBN: 9780137488179Non è quello che usi tu?Cambia libro di testo
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Giancoli Douglas 5th editionCh. 02 - Describing Motion: Kinematics in One DimensionProblema 6a
Giancoli Douglas 5th editionCh. 02 - Describing Motion: Kinematics in One DimensionProblema 6aCapitolo 2, Problema 6a
A horse trots away from its trainer in a straight line, moving 38 m away in 7.4 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed
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Step 1: Understand the concept of average speed. Average speed is defined as the total distance traveled divided by the total time taken. The formula is: , where is the total distance and is the total time.
Step 2: Calculate the total distance traveled by the horse. First, it moves 38 m away from the trainer. Then, it gallops halfway back, which is m. Add these distances to find the total distance: .
Step 3: Calculate the total time taken. The horse takes 7.4 s to move 38 m away and 1.8 s to gallop halfway back. Add these times to find the total time: .
Step 4: Substitute the total distance and total time into the formula for average speed: .
Step 5: Simplify the expression to find the average speed. Ensure the units are consistent (meters for distance and seconds for time) and express the result in meters per second (m/s).
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Concetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Average Speed
Average speed is defined as the total distance traveled divided by the total time taken. It provides a measure of how fast an object is moving over a specific period, regardless of the direction of travel. In this scenario, the horse's average speed can be calculated by considering both the distance it trotted away and the distance it galloped back.
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Percorso guidato
05:44
Solving Constant and Average Velocity Problems
Distance and Displacement
Distance refers to the total path length traveled by an object, while displacement is the straight-line distance from the initial to the final position, including direction. In this problem, the horse's total distance includes both the distance trotted away and the distance galloped back, which is essential for calculating average speed.
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Percorso guidato
06:13Displacement vs. Distance
Time Calculation
Time calculation involves summing the time intervals during which an object is in motion. In this case, the total time includes the time taken to trot away and the time taken to gallop back. Accurate time measurement is crucial for determining average speed, as it directly influences the final calculation.
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Percorso guidato
04:43Calculating Displacement from Velocity-Time Graphs
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