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Get Full Access to Physics: Principles With Applications - 6 Edition - Chapter 10 - Problem 2p
Get Full Access to Physics: Principles With Applications - 6 Edition - Chapter 10 - Problem 2p

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# What is the approximate mass of air in a living room 4.8 m

ISBN: 9780130606204 3

## Solution for problem 2P Chapter 10

Physics: Principles with Applications | 6th Edition

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Problem 2P

Problem 2P

What is the approximate mass of air in a living room 4.8 m × 3.8 m × 2.8 m?

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ANSWER: The mass of the book is 2 kg. The height of the table is 0.75 m. When you lift the book upwards, the work is done by you and considered as a positive work, because you did work against gravity. When you bring the book downward, the work is done by the book and also considered as negative work, because you did the work for gravity. These are the ways we have defined gravitational potential energy has defined. a) work done by gravity on the book You took the book to a bookshelf 2.3 m above the floor. So the net displacement for the book while taking it up is, 2.3 0.75 = 1.55 meters. The force you have applied on the book is, F = ma = 2 kg × 9.8 m/s = 19.6 N We know the work is, W = force × displacement = 19.6 N × 1.55 m = 30.38 jules The force is downward (gravity) and the displacement is upwards, so the cosine of the angle between them gives a minus sign. So while taking the book up you did a work of -30.38 jules. b) Work done by your hand on the book W = force × displacement = 19.6 N × 1.55 m = 30.38 jules The force is upward (by your hand) and the displacement is also upwards, so the cosine of the angle between them gives a plus sign. CONCLUSION: So the work done by gravity is -30.38 jules and the work done by your hand is +30.38 jules.

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##### ISBN: 9780130606204

Physics: Principles with Applications was written by and is associated to the ISBN: 9780130606204. Since the solution to 2P from 10 chapter was answered, more than 471 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 2P from chapter: 10 was answered by , our top Physics solution expert on 03/03/17, 03:53PM. This textbook survival guide was created for the textbook: Physics: Principles with Applications, edition: 6. The answer to “What is the approximate mass of air in a living room 4.8 m × 3.8 m × 2.8 m?” is broken down into a number of easy to follow steps, and 19 words. This full solution covers the following key subjects: Book, much, work, floor, gravity. This expansive textbook survival guide covers 35 chapters, and 3914 solutions.

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