(a) Explanation Given data: Mass of the book ( m ) is 2.0 kg. The book lies on the 0.75 m high table. It is required to place the book on bookshelf which is 2.3 m above the floor. Formula used: Write the expression for work done by the particle as follows. W = F d cos θ (1) Here, F is the applied force, d is the displacement, and θ is the angle between applied force and the direction of displacement. Write the expression for force as follows. F = m a (2) Here, m is the mass of the particle, and a is the acceleration due to gravity, which is 9.8 m s 2 . Explanation: From equation (2), substitute m a for F in equation (1). W = m a d cos θ (3) Modify the expression to find the work done by the gravity on the book as follows. W g = m a d cos ( θ g ) (4) Here, θ g is the angle between the force of gravity and the direction of displacement of book. Consider the direction of applied force to lift the book is in the same direction as the direction of displacement of the book. The direction of gravitational force is opposite to the direction of applied for the given system. Therefore, the angle between gravitation force and direction of displacement of book ( θ g ) is 180 ° . Write the expression to find the actual displacement of the book for the given system as follows. d = d bookshelf − d table (5) Here, d bookshelf is the height of the bookshelf, and d table is the height of the table (b) To determine To find: The work done by the hand on the book.

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ISBN: 9781323515303

Author: Knight

Publisher: PEARSON C

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

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Chapter 10, Problem 1P

(a)

To determine

To find: The work done by the gravity on the book.

(b)

To determine

To find: The work done by the hand on the book.

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The work done by the gravity on the book.

Solution Summary: The author explains how to find the work done by the gravity on the book.

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To find: The work done by the gravity on the book.

To find: The work done by the hand on the book.

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