Problem A dog can live 8 years. You want to see your dog when you are at 100 years old. And you are 20 years old currently. There is many ways to elongate life of your dog. And one of them is your dog travel near speed of light and dilate some time. Consider minimum and assume you don't have to see it for 80 years, How fast does your dog has to travel in term of speed of light to see your dog at 8 years old? First, calculate Lorentz factor.

Problem A dog can live 8 years. You want to see your dog when you are at 100 years old. And you are 20 years old currently. There is many ways to elongate life of your dog. And one of them is your dog travel near speed of light and dilate some time. Consider minimum and assume you don't have to see it for 80 years, How fast does your dog has to travel in term of speed of light to see your dog at 8 years old? First, calculate Lorentz factor.

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter12: Relativity, Particle Physics, And Cosmology

Section: Chapter Questions

Problem 1P

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My answer is incorrect, please write your explanation(process detail) why the answer is PV and write why my answer is wrong. I attach the image and write my process of explanation. My solution: When the observer is moving away with a speed of vo. Using Doppler's effect for this case, f=fov-vov Then observer speed will be vo=v1-ffo putting the values vo=v1-pfofovo=v1-p Hence, the speed of the observer (moving away) is vo=v1-p. Professor's solution and answer (I attach in the image)