(a) Explanation Given info: The car can accelerate from rest to u in T s . The power P is ratio of the work done w and time t , P = w t (1) According to work energy theorem, the total work done in the form of change in kinetic energy is, w = 1 2 m v f 2 − 1 2 m v i 2 Here, m is the mass of object. u i is the initial speed of the object. u f is the final speed of the object. Substitute 1 2 m u f 2 − 1 2 m u i 2 for w in the equation (1), P = w t = 1 2 m v f 2 − 1 2 m v i 2 t . (2) For rest position to speed u m / sec in T s , Substitute 0 m / sec for v i , u m / sec for v f and T sec for t in equation (2) (b) To determine The velocity of the car at 2 T s after starting.

Physics, Books a la Carte Edition (5th Edition)

5th Edition

ISBN: 9780134020853

Author: James S. Walker

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.

Question

Chapter 7, Problem 54PCE

(a)

To determine

The time taken for the car to accelerate from u to 2u.

(b)

To determine

The velocity of the car at 2T s after starting.

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Chapter 7, Problem 53PCE

Chapter 7, Problem 57GP

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Physics, Books a la Carte Edition (5th Edition)

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The time taken for the car to accelerate from u to 2 u .

Solution Summary: The author explains how the car can accelerate from rest to u in Tmathrm

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The time taken for the car to accelerate from u to 2u.

The velocity of the car at 2T s after starting.

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Chapter 7 Solutions