21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 18, Problem 19QP
To determine
Is the twin A ever return before twin B was born.
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Imagine an astronaut on a trip to Sirius, which lies 8 light - years from Earth. Upon arrival at Sirius, the astronaut finds that the trip lasted 6 years. If the trip was made at a constant speed of 0.8c, how can the 8 - light - year distance be reconciled with the 6 - year duration?
An astronaut takes a trip to Sirius, which is located a distance of 8 light-years from the Earth. The astronaut measures the time of the one-way journey to be 6 years. If the spaceship moves at a constant speed of 0.8c, how can the 8-ly distance be reconciled with the 6-year trip time measured by the astronaut?
I am so confused on relative length and proper length. is it 7.07 or 70.7?
Chapter 18 Solutions
21st Century Astronomy
Ch. 18.1 - Prob. 18.1CYUCh. 18.2 - Prob. 18.2CYUCh. 18.3 - Prob. 18.3CYUCh. 18.4 - Prob. 18.4CYUCh. 18 - Prob. 1QPCh. 18 - Prob. 2QPCh. 18 - Prob. 3QPCh. 18 - Prob. 4QPCh. 18 - Prob. 5QPCh. 18 - Prob. 6QP
Ch. 18 - Prob. 7QPCh. 18 - Prob. 8QPCh. 18 - Prob. 9QPCh. 18 - Prob. 10QPCh. 18 - Prob. 11QPCh. 18 - Prob. 12QPCh. 18 - Prob. 13QPCh. 18 - Prob. 14QPCh. 18 - Prob. 15QPCh. 18 - Prob. 16QPCh. 18 - Prob. 17QPCh. 18 - Prob. 18QPCh. 18 - Prob. 19QPCh. 18 - Prob. 20QPCh. 18 - Prob. 21QPCh. 18 - Prob. 22QPCh. 18 - Prob. 23QPCh. 18 - Prob. 24QPCh. 18 - Prob. 25QPCh. 18 - Prob. 26QPCh. 18 - Prob. 27QPCh. 18 - Prob. 28QPCh. 18 - Prob. 29QPCh. 18 - Prob. 30QPCh. 18 - Prob. 31QPCh. 18 - Prob. 32QPCh. 18 - Prob. 33QPCh. 18 - Prob. 34QPCh. 18 - Prob. 35QPCh. 18 - Prob. 36QPCh. 18 - Prob. 37QPCh. 18 - Prob. 38QPCh. 18 - Prob. 39QPCh. 18 - Prob. 40QPCh. 18 - Prob. 41QPCh. 18 - Prob. 42QPCh. 18 - Prob. 43QPCh. 18 - Prob. 44QPCh. 18 - Prob. 45QP
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- Why are gravitational waves hard to detect and is there a way to simplify the process? How?arrow_forwardAn astronomer on the Earth observes a meteoroid inthe southern sky approaching the Earth at a speed of0.800c. At the time of its discovery the meteoroid is20.0 ly from the Earth. Calculate (a) the time intervalrequired for the meteoroid to reach the Earth as measuredby the Earthbound astronomer, (b) this timeinterval as measured by a tourist on the meteoroid,and (c) the distance to the Earth as measured by thetourist.arrow_forwardGalaxy A is reported to be receding from us with a speed of 0.35c. Galaxy B, located in precisely the opposite direction, is also found to be receding from us at this same speed.What multiple of c gives the recessional speed an observer on Galaxy A would find for (a) our galaxy and (b) Galaxy B?arrow_forward
- Suppose a particle called a kaon is created by cosmic radiation striking the atmosphere. It moves by you at .980c, and it lives 1.24 x 10-8 s when at rest relative to an observer. How long does it live as you observe it?arrow_forwardChoose the BEST answer to the following: To say thatE=mc2 is to say that energy (a) increases as the speed of light squared. (b) is twice as much as the speed of light. (c) and mass are equivalent. (d) equals mass traveling at the speed of light squared.arrow_forwardWhen a laser beam is projected onto the Moon from an Earth-based telescope, the spot may travel faster than light over the Moon's surface. Is this a violation of current relativity theory? Rather of traveling over the Moon's surface, light is being delivered from Earth to the Moon.)arrow_forward
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