Student Workbook for College Physics: A Strategic Approach Volume 1 (Chs. 1-16)

3rd Edition

ISBN: 9780321908865

Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field

Publisher: PEARSON

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Textbook Question

Chapter 21, Problem 89MSPP

A Lightning Strike

Storm clouds build up large negative charges, as described in the chapter. The charges dwell in charge centers, regions of concentrated charge. Suppose a cloud has –25 C in a 1.0|dash|km|dash|diameter spherical charge center located 10 km above the ground, as sketched in Figure P21.86. The negative charge center attracts a similar amount of positive charge that is spread on the ground below the cloud.

Figure P21.86

Chapter 21, Problem 89MSPP, A Lightning Strike Storm clouds build up large negative charges, as described in the chapter. The

The charge center and the ground function as a charged capacitor, with a potential difference of approximately 4 × 10⁸ V. The large electric field between these two "electrodes" may ionize the air, leading to a conducting path between the cloud and the ground. Charges will flow along this conducting path, causing a discharge of the capacitor-a lightning strike.

If 12.5 C of charge is transferred from the cloud to the ground in a lightning strike, what fraction of the stored energy is dissipated?

A. 12%

B. 25%

C. 50%

D. 75%

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Chapter 21, Problem 88MSPP

Chapter 21, Problem 90MSPP

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་ The position of a particle is described by r = (300e 0.5t) mm and 0 = (0.3t²) rad, where t is in seconds. Part A Determine the magnitude of the particle's velocity at the instant t = 1.5 s. Express your answer to three significant figures and include the appropriate units. v = Value Submit Request Answer Part B ? Units Determine the magnitude of the particle's acceleration at the instant t = 1.5 s. Express your answer to three significant figures and include the appropriate units. a = Value A ? Units

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Chapter 21 Solutions

Student Workbook for College Physics: A Strategic Approach Volume 1 (Chs. 1-16)

Ch. 21 - By moving a 10 nC charge from point A to point B,...Ch. 21 - Charge q is fired through a small hole in the...Ch. 21 - Why is the potential energy of two opposite...Ch. 21 - An electron (q = e) completes half of a circular...Ch. 21 - An electron moves along the trajectory from i to f...Ch. 21 - The graph in Figure Q21.61Q shows the electric...Ch. 21 - As shown in Figure Q21.7, two protons are launched...Ch. 21 - Each part of Figure Q21.8 shows one or more point...Ch. 21 - Figure Q21.9 shows two points inside a capacitor....Ch. 21 - A capacitor with plates separated by distanced is...

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