21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 18, Problem 17QP
To determine
The speed of the light from the laser pointer and speed observed by the person on planet.
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An 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?
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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For an astronaut traveling to a star 10 lightyears away at v=0.99c and returning, spending negligible amount of time at the destination, describe the journey as the astronaut would observe it. In particular, describe what the astronaut would observe as happening on Earth during the journey
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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- If 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_forwardIf 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_forwardExplain the term general relativity?arrow_forward
- If you travel at one half the speed of light, How long does it take to reach a star which is 4 light years away? 2 years 4 years 8 years 16 years none of thesearrow_forwardWhile on board a starship, you intercept signals from four shuttle craft that are moving either directly toward or directly away from you.The signals have the same proper frequency f0.The speed and direction (both relative to you) of the shuttle craft are (a) 0.3c toward, (b) 0.6c toward, (c) 0.3c away, and (d) 0.6c away. Rank the shuttle craft according to the frequency you receive, greatest first.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
- If 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_forwardYou have been hired as an expert witness in the future by an attorney representing the driver of a spacecraft. The driver is accused of exceeding the galactic speed limit of 0.700c relative to the Earth while being chased by a galactic police spacecraft. The driver claims he is innocent, that his speed was well below that limit. You have been provided with the following data: the police spacecraft was traveling at 0.600c while chasing the driver and a technician on the police spacecraft measured the suspected spacecraft as traveling at 0.300c relative to the police spacecraft. What advice should you give the attorney?arrow_forwardIf 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 allarrow_forward
- If you were traveling inside a spaceship at a speed of c/2 relative to Earth and you fired a laser beam in the direction of the spaceship’s motion, the light from the laser would travel at a speed of 2c relative to Earth. Group of answer choices True Falsearrow_forwardAnswer both of the following questions regarding Special Relativity: a) An astronaut leaves their twin behind on Earth and departs on a journey on a spacecraft travelling at a speed of 0.840c. After 40.0 years pass on Earth, the astronaut returns to Earth to find that their age is now different from their twin. Both twins were 20 years old when the journey started. How old is the astronaut upon returning to Earth?arrow_forward26. An observer on Earth observes Planet X to be 24 light-years away and stationary. An observer in a spaceship passing Earth on its way to Planet X observes Planet X to be 14.4 light-years away. According to the observer in the spaceship, how much time passes between Earth passing by and Planet X passing by? 28 years 22 years 24 years 18 years 32 yearsarrow_forward
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