College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000



College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

(a) All but the closest galaxies are receding from our own Milky Way Galaxy. If a galaxy 12.0 × 10 9 ly ly away is receding from us at 0. 0.900c, at what velocity relative to us must we send an exploratory probe to approach the other galaxy at 0.990c, as measured from that galaxy? (b) How long will it take the probe to reach the other galaxy as measured from the Earth? You may assume that the velocity of the other galaxy remains constant. (c) How long will it then take for a radio signal to be beamed back? (All of this is possible in principle, but not practical.)

To determine


The velocity to which we have to send the exploratory probe so that it can approach at the other galaxy.


Given info:

  • The galaxy is receding from us with speed 0.900c.
  • The relative speed of the exploratory probe about galaxy is 0.990c.
  • The galaxy is 12×109ly away from us.

Formula used:

Formula to find the velocity of space probe sent by us to approach another galaxy is,


Here, uis the velocity of the probe relative to the galaxy, vrelative velocity between Earth and galaxy, u'is the velocity of the probe with respect the Earth and cis the speed of light

To determine


The time taken by probe to reach at the other galaxy.

To determine


The time taken by radio signals to beam back.

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Around the world, most people are lactose intolerant T F

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

Why is the study of chiral molecules important in biochemistry?

Chemistry for Today: General, Organic, and Biochemistry

U.S. life expectancy at birth is the highest in the world. _____ True _____ False

Nutrition Through the Life Cycle (MindTap Course List)