Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 21, Problem 5CC
To determine
At what speed the light is coming from one spaceship as observed by observer in another spaceship and as observed by an observer on a stationary planet at the midway, given that the two spaceships are traveling at 90% of the
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Students have asked these similar questions
If you are in a spaceship, traveling at 90% the speed of light, how much time will pass for you?
A: 4.3 years
B 8.7 years
C: 20 years
D: None at all
Suppose you decide to travel to a star 85 light-years away at a speed that tells you the distance is only 25 light-years. How much is that speed?
If you were traveling in a spaceship at a speed of 0.7c relative to Earth and you fired a laser beam in the direction of the spaceship’s motion, the light from the laser would seem to travel travel at a speed of 1.7c relative to Earth
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Chapter 21 Solutions
Universe
Ch. 21 - Prob. 1CCCh. 21 - Prob. 2CCCh. 21 - Prob. 3CCCh. 21 - Prob. 4CCCh. 21 - Prob. 5CCCh. 21 - Prob. 6CCCh. 21 - Prob. 7CCCh. 21 - Prob. 8CCCh. 21 - Prob. 9CCCh. 21 - Prob. 10CC
Ch. 21 - Prob. 11CCCh. 21 - Prob. 12CCCh. 21 - Prob. 13CCCh. 21 - Prob. 14CCCh. 21 - Prob. 15CCCh. 21 - Prob. 16CCCh. 21 - Prob. 17CCCh. 21 - Prob. 18CCCh. 21 - Prob. 19CCCh. 21 - Prob. 20CCCh. 21 - Prob. 21CCCh. 21 - Prob. 1QCh. 21 - Prob. 2QCh. 21 - Prob. 3QCh. 21 - Prob. 4QCh. 21 - Prob. 5QCh. 21 - Prob. 6QCh. 21 - Prob. 7QCh. 21 - Prob. 8QCh. 21 - Prob. 9QCh. 21 - Prob. 10QCh. 21 - Prob. 11QCh. 21 - Prob. 12QCh. 21 - Prob. 13QCh. 21 - Prob. 14QCh. 21 - Prob. 15QCh. 21 - Prob. 16QCh. 21 - Prob. 17QCh. 21 - Prob. 18QCh. 21 - Prob. 19QCh. 21 - Prob. 20QCh. 21 - Prob. 21QCh. 21 - Prob. 22QCh. 21 - Prob. 23QCh. 21 - Prob. 24QCh. 21 - Prob. 25QCh. 21 - Prob. 26QCh. 21 - Prob. 27QCh. 21 - Prob. 28QCh. 21 - Prob. 29QCh. 21 - Prob. 30QCh. 21 - Prob. 31QCh. 21 - Prob. 32QCh. 21 - Prob. 33QCh. 21 - Prob. 34QCh. 21 - Prob. 35QCh. 21 - Prob. 36QCh. 21 - Prob. 37QCh. 21 - Prob. 38QCh. 21 - Prob. 39QCh. 21 - Prob. 40QCh. 21 - Prob. 41QCh. 21 - Prob. 42QCh. 21 - Prob. 43QCh. 21 - Prob. 44QCh. 21 - Prob. 45QCh. 21 - Prob. 46QCh. 21 - Prob. 47QCh. 21 - Prob. 48QCh. 21 - Prob. 49QCh. 21 - Prob. 50QCh. 21 - Prob. 51QCh. 21 - Prob. 52QCh. 21 - Prob. 53QCh. 21 - Prob. 54QCh. 21 - Prob. 55QCh. 21 - Prob. 56QCh. 21 - Prob. 57QCh. 21 - Prob. 58QCh. 21 - Prob. 59QCh. 21 - Prob. 60QCh. 21 - Prob. 61QCh. 21 - Prob. 62QCh. 21 - Prob. 63QCh. 21 - Prob. 64QCh. 21 - Prob. 65QCh. 21 - Prob. 66QCh. 21 - Prob. 67QCh. 21 - Prob. 68QCh. 21 - Prob. 69QCh. 21 - Prob. 70QCh. 21 - Prob. 71QCh. 21 - Prob. 72QCh. 21 - Prob. 73QCh. 21 - Prob. 74QCh. 21 - Prob. 75QCh. 21 - Prob. 85QCh. 21 - Prob. 86Q
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- If general relativity offers the best description of what happens in the presence of gravity, why do physicists still make use of Newton’s equations in describing gravitational forces on Earth (when building a bridge, for example)?arrow_forwardIf you use an Earth based telescope to project a laser beam onto the moon, you can move the spot across the moon's surface at a velocity greater than the speed of light Does this violate modern relativity? (Note that light is being sent from the Earth to the moon, not across the surface of the moon.)arrow_forwardWhich of Einstein’s postulates of special relativity includes a concept that does not ?t with the ideas of classical physics? Explain.arrow_forward
- When we speak of time dilation, do we mean that time passes more slowly in moving systems or that it simply appears to do so?arrow_forwardFigure P9.21 shows a jet of material (at the upper right) being ejected by galaxy M87 (at the lower left). Such jets are believed to be evidence of supermassive black holes at the center of a galaxy. Suppose two jets of material from the center of a galaxy are ejected in opposite directions. Both jets move at 0.750c relative to the galaxy center. Determine the speed of one jet relative to the other. Figure P9.21arrow_forwardA woman living in galaxy X is about to deliver her first baby. The nearest hospital is in galaxy Y, which is 1.0 x 1012 m away. The woman flew to the hospital in her spaceship at 0.8c. She gave birth one hour after she started flying as timed by her. From the point of view of the nurses at the hospital: i) What was the elapsed time when the woman watch indicated one hour?ii) How far did she travel in that one hour?iii) Was the baby born in the hospital? Justify your answerarrow_forward
- What do you understand by time dilation? What is proper time and establish a relation for proper time. A beam of particle of half-life 2×10-8 sec travels in laboratory with speed 0.96 times the speed of light. How much distance does the beam travel before the flux falls to ½ time the initial flux.arrow_forwardImagine two civilizations from different planets that have started an intergalactic war. During a space battle, a missile is shot from spaceship one toward spaceship two. The missile leaves the spaceship one at 0.970c (in spaceship one's reference frame) and approaches spaceship two at 0.749c (in spaceship two's reference frame). What is the relative velocity of the two spaceships in units of c? Hint: keep in mind that the two spaceships are approaching each other. Round your answer to three decimal places.arrow_forwardA woman living in galaxy X is about to deliver her first baby. The nearest hospital is in galaxy Y, which is 1.0 x 1012 m away. The woman flew to the hospital in her spaceship at 0.8c. She gave birth one hour after she started flying as timed by her. From the point of view of the nurses at the hospital: i) What was the elapsed time when the woman watch indicated one hour? ii) Howfar did she travel in that one hour? iii) Was the baby born in the hospital? Justify your answerarrow_forward
- A severely injured Peter can only live for the next 3.5 hours. Before dying, he wants to go back to Earth which is 5 light-hours away. What should be the minimum cruise speed of the Peter's spaceship so that at least he can make it before he runs out of time? HINT: The answer is NOT 4.29x108 m/s. Wrong answers will be downvoted. Thank you.arrow_forwardAn astronaut is traveling in a spacecraft at a speed of 0.8 times the speed of light (0.8c) relative to an observer on Earth. If the astronaut spends 5 years according to their own onboard clock, how much time will have passed on Earth when they return?arrow_forwardSuppose an astronaut travels to a star 10 lightyears away at a significant fraction of the speed of light (for example, v=0.99c) and returns. Assume negligible amount of time is spent at the destination. Does this round-trip journey take less than, equal to, or more than 20 years as observed by an Earth-based observer? Does this round-trip journey take less than, equal to, or more than 20 years as observed by the astronaut?arrow_forward
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