(II) A light-year is the distance light travels in one year (at speed = 2.998 x 10*m/s). (a) How many meters are there in 1.00 light-year? (b) An astronomical unit (AU) is the average distance from the Sun to Earth, 1.50 × 10 km. How many AU are there in 1.00 light-year?

(II) A light-year is the distance light travels in one year (at speed = 2.998 x 10*m/s). (a) How many meters are there in 1.00 light-year? (b) An astronomical unit (AU) is the average distance from the Sun to Earth, 1.50 × 10 km. How many AU are there in 1.00 light-year?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter1: Units And Measurement

Section: Chapter Questions

Problem 44P: A furlong is 220 yd. A fortnight is 2 weeks. Convert a speed of one furlong per fortnight to...

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Concept explainers

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

Question

Recent findings in astrophysics suggest that the observable universe can be modeled as a sphere of radius R=13.7x10⁹light-years=13.0 x 10²⁵m with an average total mass density of about 1x10^-26kg/m³ Only about 4% of total mass is due to “ordinary” matter (such as protons, neutrons, and electrons). Estimate how much ordinary matter (in kg) there is in the observable universe. (For the light-year, see Problem 19.)

(II) A light-year is the distance light travels in one year (at
speed = 2.998 x 10*m/s). (a) How many meters are
there in 1.00 light-year? (b) An astronomical unit (AU) is
the average distance from the Sun to Earth, 1.50 × 10 km.
How many AU are there in 1.00 light-year?

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