{"id":2916,"date":"2020-10-31T07:49:46","date_gmt":"2020-10-31T07:49:46","guid":{"rendered":"http:\/\/onlineclassesguru.com\/?p=2916"},"modified":"2020-10-31T07:49:46","modified_gmt":"2020-10-31T07:49:46","slug":"physics-questions-2","status":"publish","type":"post","link":"https:\/\/onlineclassesguru.com\/index.php\/2020\/10\/31\/physics-questions-2\/","title":{"rendered":"Physics questions"},"content":{"rendered":"<style type=\"text\/css\"><\/style><ol>\n<li>(a) In communicating with an astronaut on the moon, 3.8 10<br \/>\n8 m from earth, what is the minimum time<br \/>\ndelay in getting a response to a question?<br \/>\n(b) What would the minimum time delay be for communication with an astronaut at a distance of 7 lightyears from earth?<\/li>\n<li>Suppose you are on Mars when it is 9.00 10<br \/>\n10 m from earth. You call earth for the correct time and<br \/>\nreceive a recorded message indicating that the time at the tone is exactly 2:13 P.M. What time should<br \/>\nyou set on your watch?<br \/>\n: P.M.<\/li>\n<li>Clock A travels to the right at a speed relative to clocks B and C. As A passes B, all clocks<br \/>\nread 12:00 (shown in the figure below). These readings could be seen simultaneously by a stationary<br \/>\nobserver O, midway between B and C, though O would make the observation at some later time.<br \/>\n(a) Clock C reads 6:00 as A passes C. What does clock A read?<\/li>\n<li>A UFO is observed directly above the earth moving at a constant velocity. An astronaut on the moon<br \/>\n(3.8 10<br \/>\n8 m from earth) observes the UFO passing overhead 4.9 s later. From the UFO&#8217;s reference<br \/>\nframe, how long did it take to travel from the earth to the moon?<\/li>\n<li>The starship Enterprise leaves a distant earth colony, which is nearly at rest with respect to the earth.<br \/>\nThe ship travels at nearly constant velocity toward earth. When the Enterprise reaches earth 1.01 y has<br \/>\nelapsed, as measured on the ship. Clocks in the earth&#8217;s reference frame show that the voyage lasted<br \/>\n3.21 y.<br \/>\nHow far from earth is the colony, as measured in the reference frame of the earth?<br \/>\n(b) How far from earth is the colony, as measured in the reference frame of the ship?<\/li>\n<li>How far from the earth would you be able to travel in a lifetime of 79 years if you were able to travel at a<br \/>\nconstant speed of 0.835c?<\/li>\n<li>How much would you age in traveling a distance of 4.73 light years from earth if you were able to travel<br \/>\nat a speed of 0.62c?<\/li>\n<li>As spaceship A moves away from the earth at the captain observes a second spaceship (B)<br \/>\nmoving in the same direction at a speed of relative to A. Find the speed of B relative to the<br \/>\nearth.<br \/>\nc<br \/>\nSpaceships A and B move in opposite directions at the same speed of relative to earth, with A<br \/>\nmoving away from earth and B moving toward earth. Find the velocity of B relative to A.<br \/>\nc<br \/>\nElectrical energy of approximately 1.00 10<br \/>\n19 J is used annually in the United States. How much rest<br \/>\nmass must be used to generate this much energy if no energy is wasted?<br \/>\n0.546c,<br \/>\n0.468c<\/li>\n<li>Quasars are faint, distant sources of radio waves. (Quasar is short for &#8220;quasi-stellar source.&#8221; They are so<br \/>\nnamed because, like a star, they appear to the astronomer to be pointlike.) From the shift in the<br \/>\nfrequency of their emitted light toward the red, called the &#8220;redshift,&#8221; we know that quasars are moving<br \/>\nvery fast. Astronomers observe that the more distant an object is from the earth, the faster it moves. In<br \/>\nthis way they determine that quasars are billions of light years from earth. To be visible at this great<br \/>\ndistance, quasars must have enormous luminosity. Typically a quasar radiates energy at a rate on the<br \/>\norder of 10<br \/>\n40 W, roughly 10<br \/>\n14 times greater than the sun or 40 times greater than the most luminous<br \/>\ngalaxy. At what rate is rest mass being consumed to produce this much radiation?<\/li>\n<\/ol>\n<p><center><a href=\"http:\/\/onlineclassesguru.com\/orders\/ordernow\"><img decoding=\"async\" src=\"https:\/\/encrypted-tbn0.gstatic.com\/images?q=tbn:ANd9GcTyj99p60XCLyLk1htB7-1neRt8-2QdnenNlQ&usqp=CAU\"target=\"_http:\/\/onlineclassesguru.com\/orders\/ordernow\"\/><\/center><p>","protected":false},"excerpt":{"rendered":"<p>(a) In communicating with an astronaut on the moon, 3.8 10 8 m from earth, what is the minimum time delay in getting a response to a question? (b) What would the minimum time delay be for communication with an astronaut at a distance of 7 lightyears from earth? Suppose you are on Mars when&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2916","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Physics questions - onlineclassesguru<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/onlineclassesguru.com\/index.php\/2020\/10\/31\/physics-questions-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Physics questions - onlineclassesguru\" \/>\n<meta property=\"og:description\" content=\"(a) In communicating with an astronaut on the moon, 3.8 10 8 m from earth, what is the minimum time delay in getting a response to a question? 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