21ST CENTURY ASTR.:STARS..(LL)-PACKAGE
21ST CENTURY ASTR.:STARS..(LL)-PACKAGE
6th Edition
ISBN: 9780393448450
Author: Kay
Publisher: NORTON
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Chapter 18, Problem 44QP

(a)

To determine

The distance of the ship reaches to the star according to the clock on the Earth.

(b)

To determine

When the person on the ship likely to return back to the Earth from the planet.

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In 2030, the Australian Space Agency launches a spaceship to our nearest neighbour Alpha Centauri (4 lightyears away). How long will the journey take according to a clock on the spaceship if it travels at v=0.999c-299482km/s (where 'c' is the speed of light equal to 299782km/s). About 6 years. Just over 2 months. About 2 years. About 4 years.
Suppose astronomers found evidence of an earth-like planet 20 lightyears away. a) what may be two ethical considerations that one may consider when deciding if humans should travel to this planet? b) how fast would a spaceship need to travel if the roundtrip can no take longer than 40 years for the astronauts? c) how much time will the trip take according to the people on earth?
Provide the correct answer in second. Previously got so many wrong answers. A muon has an average life time t_0 = 2.2μs from Earth's frame of referance. Needed distance for them to be found on earth surface is 6Km . What is the average life time of muon from it's own frame of referance if they are travelling with an speed of 2.978×108 m/s ?
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