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Get Full Access to Modern Physics For Scientists And Engineers - 4 Edition - Chapter 2 - Problem 91
Get Full Access to Modern Physics For Scientists And Engineers - 4 Edition - Chapter 2 - Problem 91

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# Frank and Mary are twins. Mary jumps on a spaceshipand goes to the star system Alpha

ISBN: 9781133103721 454

## Solution for problem 91 Chapter 2

Modern Physics for Scientists and Engineers | 4th Edition

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Modern Physics for Scientists and Engineers | 4th Edition

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Problem 91

Frank and Mary are twins. Mary jumps on a spaceshipand goes to the star system Alpha Centauri (4.30 lightyearsaway) and returns. She travels at a speed of 0.8cwith respect to Earth and emits a radio signal everyweek. Frank also sends out a radio signal to Mary oncea week. (a) How many signals does Mary receive fromFrank before she turns around? (b) At what time doesthe frequency of signals Frank receives suddenlychange? How many signals has he received at thistime? (c) How many signals do Frank and Mary receivefor the entire trip? (d) How much time does thetrip take according to Frank and to Mary? (e) Howmuch time does each twin say the other twin will measurefor the trip? Do the answers agree with those for(d)?

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Political Science 310 Section 4 Pt 1.1 - Intro o World War I – why war – Waltz o WWI  Alliances:  Formal/informal agreements sovereign states enter into to assure mutual security  Catalyst: June 28, 1914  Assassination of Archduke Ferdinand, heir to Hapsburg throne o Serbs wanted to be independent - Levels of analysis o 1. Level 1 – individual  Franz Joseph: Astro-Hungarian emperor  Influenced by his advisors  Offers ultimatums  Czar Nicholas II – Russia  Isolated own concerns of assassination  Not good advisors  Wilhelm Kaiser II – Germany  Advisors wanted to go to war  Diverting attention from domestic problems o Diversionary War Theory  Underestimated response of Russia  Cousin of Nicholas II  Telegrams between Wilhelm and Nicholas o Level II – State (domestic level)  Nationalism  Glorification of state  Your states interests are considered supreme  Domestic unrest  Inflamed by nationalism o Austro-Hungarian – wanted to preserve it and wen

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