Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 26, Problem 39Q
To determine

The length of each side of the box and its density at z=4.97 when compared to the present day.

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Question 1: What is the null hypothesis in the test we have just performed? Would we accept the null hypothesis in this test? Why or why not?
suppose you collected a data set in which you measured fall-times for different fall-heights, you plotted the data and fit the mathemathical model, y=Ax^2, to match the physical hypothesis, y=0.5*g*t^2. From the best fit curve you are told that the value of your fit-parameter, A, is for 4.6 m/s^2 +/- 0.4 m/s^2. Determine the value of g +/- delta g for this fit parameter value.
I asked the following question and was given the attached solution: Suppose that the universe were full of spherical objects, each of mass m and radius r . If the objects were distributed uniformly throughout the universe, what number density (#/m3) of spherical objects would be required to make the density equal to the critical density of our Universe? Values:  m = 4 kg r = 0.0407 m Answer must be in scientific notation and include zero decimal places (1 sig fig --- e.g., 1234 should be written as 1*10^3)   I don't follow the work and I got the wrong answer, so please help and show your work as I do not follow along easily thanks
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