(a) The distance to Polaris, the North Star, is approximately6.44 x 1018 m. If Polaris were to burn out today, how manyyears would it take to see it disappear? (b) How long doesit take sunlight to reach Earth? (c) How long does it take amicrowave signal to travel from Earth to the Moon and back?(The distance from Earth to the Moon is 3.84 x 105 km.)

(a) The distance to Polaris, the North Star, is approximately6.44 x 1018 m. If Polaris were to burn out today, how manyyears would it take to see it disappear? (b) How long doesit take sunlight to reach Earth? (c) How long does it take amicrowave signal to travel from Earth to the Moon and back?(The distance from Earth to the Moon is 3.84 x 105 km.)

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter5: Relativity

Section: Chapter Questions

Problem 36P: Describe the following physical occurrences as events, that is, in the form (x, y, z, t): (a) A...

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Describe the following physical occurrences as events, that is, in the form (x, y, z, t): (a) A postman rings a doorbell of a house precisely at noon. (b) At the same lime as the doorbell is lung, a slice of bread pops out of a toaster that is located 10 1T1 from the door in the east direction from the door. (c) Tell seconds later, an airplane arrives at the airport, which is 10 km from the door in the east direction and 2 km to the south.
(a) The distance to a star is approximately 5.50 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear? 581.35 years (b) How long does it take sunlight to reach Earth? 8.33 minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.) X 1.28 Your response differs from the correct answer by more than 10%. Double check your calculations. S
(a) The distance to a star is approximately 4.97 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take sunlight to reach Earth? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.) S
(a) The distance to a star is approximately 6.74 ✕ 1018 m. If this star were to burn out today, in how many years would we see it disappear? ___ years(b) How long does it take sunlight to reach Earth? ____ minutes(c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 ✕ 105 km.)______ s
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Lunar astronauts placed a reflector on the Moon’s surface, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. (a) To what accuracy in meters can the distance to theMoon be determined if this time can be measured to 0.100 ns? (b) What percent accuracy is this, given the average distance to the Moon is 384,400 km?
A space station while in orbit sends out a radar (EM) wave. It takes the wave 1.20seconds to strike an object and returnto the space station. How far away was the objectin units of metres?How far away was the object in units of miles?