EP CONCEPTUAL PHYSICS-ONLINE ACCESS
9th Edition
ISBN: 9780133246810
Author: Hewitt
Publisher: SAVVAS L
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Question
Chapter 15, Problem 27A
To determine
To Explain: When someone looks out into the universe, he/she sees into the past.
Expert Solution & Answer
Explanation of Solution
Introduction:
According to Albert
When observer looks out into the surrounding, the light reflected from the object incident on the observer’s retina gives the sensation of the object. Suppose the observer saw a star in the sky which is 10 billion light years from the earth.The time taken for light to reach the person from star is 10 billion years. So, star seen by the observer presently is not the actual star, but the star 10 billion years ago. With similar analogy, every object around seen by naked eyes is the object certain time ago, because light takes time to reach eyes.
Conclusion:
Therefore, when universe is seen by the observer, light takes time to reach from object to person. Due to that reason,when observer look out into the universe, he/she sees into the past.
Chapter 15 Solutions
EP CONCEPTUAL PHYSICS-ONLINE ACCESS
Ch. 15 - What is space-time?Ch. 15 - Can you travel while remaining in one place in...Ch. 15 - Does light travel through space? Through time?...Ch. 15 - What is time dilation?Ch. 15 - Prob. 5ACh. 15 - Prob. 6ACh. 15 - Prob. 7ACh. 15 - The path of light in a vertical 'light clock' in a...Ch. 15 - If we view a passing spaceship and see that the...Ch. 15 - If you were traveling in a high-speed rocket ship,...
Ch. 15 - Prob. 11ACh. 15 - What are the present-day obstacles to interstellar...Ch. 15 - Prob. 13ACh. 15 - Prob. 14ACh. 15 - If you were traveling in a high-speed spaceship,...Ch. 15 - Prob. 16ACh. 15 - Prob. 17ACh. 15 - If a spaceship moves away from you at half the...Ch. 15 - If the spaceship in question 18 somehow travels at...Ch. 15 - Substitute small values of v1 and v2 in the...Ch. 15 - If you were in a smooth-riding train with no...Ch. 15 - Suppose you're playing catch with a friend in a...Ch. 15 - Prob. 23ACh. 15 - People who ride in a bus all know they're moving...Ch. 15 - Prob. 25ACh. 15 - Prob. 26ACh. 15 - Prob. 27ACh. 15 - Prob. 28ACh. 15 - If you were in a high-speed spaceship traveling...Ch. 15 - Prob. 30ACh. 15 - Prob. 31ACh. 15 - Prob. 32ACh. 15 - Joe Burpy is 30 years old and has a daughter who...Ch. 15 - Assume that your heart normally beats once every...Ch. 15 - Thomas, a rhino, is 2.5 meters long when at rest....Ch. 15 - A ship whizzes by you at 0.60c. Someone aboard is...Ch. 15 - Before leaving the planet Hislaurels for a...Ch. 15 - You are standing facing forward on the floor of...Ch. 15 - Pinocchio is concerned that Gepetto will see his...Ch. 15 - Lizzie is scooting down the Interstate at 17...
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