Concept explainers
Whether the gain in organized kinetic energy, as a car burns more gasoline, contradicts second law of
Answer to Problem 1RQ
Solution:
No.
Explanation of Solution
Introduction:
Energy of an isolated system, such as the universe always remains constant, as stated by the law of conservation of energy. Energy is transformed into various forms such as disordered form of energy (thermal energy) or ordered form of energy (kinetic and potential energy).
Energy available in the universe is in ordered and disordered form. Although the energy is conserved at all times, only the energy thatcan be used to provide a useful work is of factual importance.
Second law of thermodynamics states that a system's ability to perform work depends upon the amount of organized form of energy present. Also, it is impossible to develop an engine thatcan convert all the disorganized form of energy (thermal energy) to useful work.
Explanation:
Gasoline is used to run the engine of the car. The engine of the car uses the chemical energy of the fuel and converts it into useful work to power the car. At first, this might seem to contradict the second law of thermodynamics, but it actually does not. This is because along with the useful work, a large amount of thermal energy is exhausted and energy in the form of sound is also lost (both being less organized form of energy), when gasoline is burnt.
So, as the car moves faster and faster, it does gain organized energy but for that more and more amount of fuel is burnt, which in turn increases the energy thatis lost to the environment. Hence, the organized form of energy (kinetic energy) gained by the car will never be more than that present in the gasoline (chemical energy).
The second law states that the ability to perform work depends upon the amount of organized form of energy present, so more the speed, more will be the amount of fuel burnt and more amount of energy will be lost.
Conclusion:
Therefore, burning of gasoline to gain organized kinetic energy does not contradict second law of thermodynamics.
Want to see more full solutions like this?
Chapter 16 Solutions
Modified Mastering Physics with Pearson eText -- Access Card -- for College Physics: Explore and Apply (18-Weeks)
- 1.62 On a training flight, a Figure P1.62 student pilot flies from Lincoln, Nebraska, to Clarinda, Iowa, next to St. Joseph, Missouri, and then to Manhattan, Kansas (Fig. P1.62). The directions are shown relative to north: 0° is north, 90° is east, 180° is south, and 270° is west. Use the method of components to find (a) the distance she has to fly from Manhattan to get back to Lincoln, and (b) the direction (relative to north) she must fly to get there. Illustrate your solutions with a vector diagram. IOWA 147 km Lincoln 85° Clarinda 106 km 167° St. Joseph NEBRASKA Manhattan 166 km 235° S KANSAS MISSOURIarrow_forwardPlz no chatgpt pls will upvotearrow_forward3.19 • Win the Prize. In a carnival booth, you can win a stuffed gi- raffe if you toss a quarter into a small dish. The dish is on a shelf above the point where the quarter leaves your hand and is a horizontal dis- tance of 2.1 m from this point (Fig. E3.19). If you toss the coin with a velocity of 6.4 m/s at an angle of 60° above the horizontal, the coin will land in the dish. Ignore air resistance. (a) What is the height of the shelf above the point where the quarter leaves your hand? (b) What is the vertical component of the velocity of the quarter just before it lands in the dish? Figure E3.19 6.4 m/s 2.1arrow_forward
- Can someone help me answer this thank you.arrow_forward1.21 A postal employee drives a delivery truck along the route shown in Fig. E1.21. Determine the magnitude and direction of the resultant displacement by drawing a scale diagram. (See also Exercise 1.28 for a different approach.) Figure E1.21 START 2.6 km 4.0 km 3.1 km STOParrow_forwardhelp because i am so lost and it should look something like the picturearrow_forward
- 3.31 A Ferris wheel with radius Figure E3.31 14.0 m is turning about a horizontal axis through its center (Fig. E3.31). The linear speed of a passenger on the rim is constant and equal to 6.00 m/s. What are the magnitude and direction of the passenger's acceleration as she passes through (a) the lowest point in her circular motion and (b) the high- est point in her circular motion? (c) How much time does it take the Ferris wheel to make one revolution?arrow_forward1.56 ⚫. Three horizontal ropes pull on a large stone stuck in the ground, producing the vector forces A, B, and C shown in Fig. P1.56. Find the magnitude and direction of a fourth force on the stone that will make the vector sum of the four forces zero. Figure P1.56 B(80.0 N) 30.0 A (100.0 N) 53.0° C (40.0 N) 30.0°arrow_forward1.39 Given two vectors A = -2.00 +3.00 +4.00 and B=3.00 +1.00 -3.00k. (a) find the magnitude of each vector; (b) use unit vectors to write an expression for the vector difference A - B; and (c) find the magnitude of the vector difference A - B. Is this the same as the magnitude of B - Ä? Explain.arrow_forward
- Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning