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Astronomers using the Hubble Space Telescope | Ch 6 - 64

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics | 4th Edition | ISBN: 9780133942651 | Authors: Randall D. Knight (Professor Emeritus) ISBN: 9780133942651 188

Solution for problem 64 Chapter 6

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics | 4th Edition

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics | 4th Edition | ISBN: 9780133942651 | Authors: Randall D. Knight (Professor Emeritus)

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics | 4th Edition

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Problem 64

Astronomers using the Hubble Space Telescope deduced thepresence of an extremely massive core in the distant galaxyM87, so dense that it could be a black hole (from which nolight escapes). They did this by measuring the speed of gasclouds orbiting the core to be 780km/s at a distance of60 light-years (5.7 X 1017 m) from the core. Deduce the massof the core, and compare it to the mass of our Sun.

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4/8/16: Hitler’s Foreign policy 1 Hitler’s Foreign Policy and the Road to World War II. ***test questions***  March 1935: Hitler announced German rearmament. o 2 goals:  Free Germany from the Treaty of Versailles.  Unite ethnic Germans with the German homeland. o Germany would expand the size of its army beyond the limit in violation to the Treaty of Versailles; build an air force; build up the navy. o Special newspapers were printed to mark Hitler’s “First great measure to liquidate Versailles”.  German rearmament.  June 1935—The Anglo­German Treaty was signed. o This treaty marked the beginning of the British policy of APPEASEMENT.  Representatives:  Britain, France and Italy o They condemned Hitler’s actions but took no force against him.  Germany could build up its navy, but limit the size of the navy.  Reasons for the policy of appeasement.  Make negotiations with Hitler and make concessions to keep the peace in Europe and avoid a war. o WWI­ did not want another one. o Some people believed that the Treaty of Versailles was too harsh and that Germany had legitimate grievances to redress. o Some people believed that a strong Germany would stop the spread of communism in Europe. o March 1936—Hitler moved troops into the Rhineland.  It was a re­militarized zone.  It was a buffer zone to protect France from a dangerous Germany.  The British and French army did nothing. o March 1938—Hitler annexed Austria.  Expand eastward into Europe.  Hitler’s long standing ambition to unite Germany and Austria.  The SUDETENLAND in Czechoslovakia.  Czechoslovakia was a new state created at the Paris Peace Conference. o The 3.5 million ethnic Germans that lived there should be united with their German homeland. o Had natural resources. o Hitler would go to war for this territory.  The response of Neville Chamberlain. 4/8/16: Hitler’s Foreign policy 2 o British Prime Minister (since 1937). o Most associated with appeasement. o Wanted to avoid a repetition of the Great War in Europe.  End of September 1938—The MUNICH CONFERENCE. o Diplomatic victory. o Subject: the fate of the Sudetenland. o The president of Czechoslovakia was not present. o Hitler will get control of Sudetenland.  Promised no more territorial demands in Europe. o Supplement:  “We regard the agreement signed last night and the Anglo­German Naval Agreement as symbolic of the desire to our two people never to go to war with one another again. We are resolved that the method of consultation should be the method adopted to deal with any other questions that may concern our two countries, and we are determined to continue our efforts to remove possible sources of differences and thus to contribute to measuring the peace of Europe.”  Neville Chamberlain and Adolf Hitler.  Anglo­German ‘Peace’ Declaration. o Critics of appeasement:  David Low: “Evening Standard.”  Winston Churchill.  His anti­appeasement attitude made him unpopular.  Excerpt from speech: o “…the German dictator, instead of snatching his victims from the table, has been content to have them served to him course by course…” o “We are in the presence of a disaster of the first magnitude, which 4/8/16: Hitler’s Foreign policy 3 has befallen Great Britain and France. Do not let us blind ourselves to that…” o “And do not suppose that this is the end. This is only the beginning of the reckoning.”  March 1939—Hitler invaded and took over the rest of Czechoslovakia. o The end of appeasement. o Act of naked aggression. o Britain and France will stand up for Poland. o Poland.  Hitler’s preparations for war:  Pact of Steel (May 1939). o Mutual aid in the event of a war.  The Nonaggression Pact (August 23, 1939). o The Soviet Union would stay neutral in the event of a war. o In return, Stalin would receive a part of Poland and other territories in eastern part of Europe.

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Chapter 6, Problem 64 is Solved
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Textbook: Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Edition: 4
Author: Randall D. Knight (Professor Emeritus)
ISBN: 9780133942651

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Astronomers using the Hubble Space Telescope | Ch 6 - 64