Concept explainers
The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. Figure 3.64 illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities: (a) relative to galaxy 2 and (b) relative to galaxy 5. The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.
Figure 3.64 Five galaxies on a straight line, showing their distances and velocities relative to the Milky Way (MW) Galaxy. The distances are in millions of light years (Mly), where a light year is the distance light travels in one year. The velocities are nearly proportional to the distances. The sizes of the galaxies are greatly exaggerated; an average galaxy is about 0.1 MlY across.
Trending nowThis is a popular solution!
Chapter 3 Solutions
College Physics For Ap® Courses
Additional Science Textbook Solutions
Conceptual Physics (12th Edition)
University Physics with Modern Physics (14th Edition)
University Physics Volume 2
Essential University Physics: Volume 2 (3rd Edition)
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
- Figure 1 of 1 *** 50 Part A Estimate how long it would take one person to mow a football field using an ordinary home lawn mower (as shown in the figure). Assume the mower moves with a 1 km/h speed, and has a 0.5m width. (Figure 1) 1 hour 110 hours 11 minutes 11 hours 110 minutesarrow_forwardThe starships of the Solar Federation are marked with the symbol of the federation, a circle, while starships of the Denebian Empire are marked with the empire’s symbol, an ellipse whose major axis is 1.40 times longer than its minor axis (a = 1.40b in Fig). How fast, relative to an observer, does an empire ship have to travel for its marking to be confused with the marking of a federation ship?arrow_forwardThe distance of a galaxy is of the order of 1025 m. Calculate the order of magnitude of time taken by light to reach us from the galaxy.arrow_forward
- Light speed c = 3.0* 108 m/s. A light year is a distance light travels in one year. Calculate a light-year in [a] km and [b] Milearrow_forwardAssume your hair grows at a rate of 1/44th of an inch per day. How fast is that in nm/s (nanometers per second)? Given that a typical atom is on the order of 1 x 10^(-10) m in diameter (see Table 1.3 on page 18 of the textbook), at approximately what rate does the protein synthesis that assembles your hair strands deposit atoms in units of atoms per second? I need the second question to be rounded to 1 significant digit.arrow_forwardPlease help within the next two hours. Your answer can be simple, but I need it fast. I only need #2 answered, I included #1 because it has some background.arrow_forward
- Imagine you derive the following expression by analyzing the physics of a particular system: v2=v20+2axv2=v02+2ax. The problem requires solving for xx, and the known values for the system are a=2.55meter/second2a=2.55meter/second2, v0=21.8meter/secondv0=21.8meter/second, and v=0meter/secondv=0meter/second. Perform the next step in the analysis.arrow_forwardA light-year is a measure of the astronomical distance that light traverses in a vacuum in 1 year. (a) How many kilometers does light traverse in 1 ly? km (b) What is the speed of light c in terms of ly per year. ly/y (c) Express your answer from (b) in terms of feet per nanosecond. ft/nsarrow_forwardWhat is the value of n+r/(2.000) 2, written with the correct number of significant figures? O 3.92699 O 3.9269 O 3.9270 O 3.927 O 3.93arrow_forward
- The nearest neutron star (a collapsed star made primarily of neutrons) is about 3.00 × 1018 m away from Earth. Given that the Milky Way galaxy (Fig. P1.81) is roughly a disk of diameter ~ 10²' m and thickness ~ 1019 m, estimate the number of neu- tron stars in the Milky Way to the nearest order of magnitude. Figure P1.81arrow_forwardAll of the stars of the Big Dipper (part of the constellation Ursa Major) may appear to be the same distance from the earth, but in fact they are very far from each other. Figure shows the distances from the earth to each of these stars. The distances are given in light-years (ly), the distance that light travels in one year. One light-year equals 9.461 * 1015 m. (a) Alkaid and Merak are 25.6 apart in the earth’s sky. In a diagram, show the relative positions of Alkaid, Merak, and our sun. Find the distance in light-years from Alkaid to Merak. (b) To an inhabitant of a planet orbiting Merak, how many degrees apart in the sky would Alkaid and our sun be?arrow_forwardAnnual sales of bottled water in a certain country in the period 2007–2014 could be approximated by R(t) = 0.08t2 − 0.26t + 8.8 billion gallons (0 ≤ t ≤ 7), where t is time in years since 2007. According to the model, were annual sales of bottled water accelerating or decelerating in 2011? acceleratingdecelerating How fast? billion gal/yr2arrow_forward
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON