Explanation Given data: Moment of inertial of the turntable ( I ) is 0.040 kg ⋅ m 2 . Time taken to complete one revolution ( T ) is 4.0 s. Formula used: Write the expression for rotational kinetic energy of an object with moment of inertia and angular velocity . K rot = 1 2 I ω 2 (1) Here, I is the moment of inertia of an object, and ω is the angular velocity of the object. Write the expression for angular velocity of the object in terms of rad s for the given conditions as follows. ω = ( 1 rev T ) ( 2 π rad rev ) (2) Here, T is the time required for the object to complete one revolution. Explanation: Calculation of angular velocity of the turntable: Substitute 4.0 s for T in equation (2). ω = ( 1 rev 4.0 s ) ( 2 π rad rev ) = 1.5707 rad s ≃ 1.57 rad s Calculation of rotational kinetic energy of the turn table: Substitute 0

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ISBN: 8220106755235

Author: Field

Publisher: PEARSON

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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 17P

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To find: The kinetic energy of the turntable.

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