×
Get Full Access to University Physics, Volume 3 - 17 Edition - Chapter 11 - Problem 67
Get Full Access to University Physics, Volume 3 - 17 Edition - Chapter 11 - Problem 67

×

ISBN: 9781938168185 2032

## Solution for problem 67 Chapter 11

University Physics, Volume 3 | 17th Edition

• Textbook Solutions
• 2901 Step-by-step solutions solved by professors and subject experts
• Get 24/7 help from StudySoup virtual teaching assistants

University Physics, Volume 3 | 17th Edition

4 5 1 344 Reviews
23
0
Problem 67

The Big Bang

(a) Calculate the approximate age of the universe from the average value of the Hubble constant, $$H_{0}=20 \mathrm{~km} / \mathrm{s} \cdot \text { Mly }$$. To do this, calculate the time it would take to travel 0.307 Mpc at a constant expansion rate of 20 km/s. (b) If somehow acceleration occurs, would the actual age of the universe be greater or less than that found here? Explain.

Text Transcription:

H_0=20 km/s times Mly

Step-by-Step Solution:
Step 1 of 3

Wednesday, February 3, y Lecture 3 Valence Shell Review ­ outermost shell = valence shell ­ 1st­ 2 electrons ­ 2nd­ 8 electrons ­ 3rd­ 8 electrons ­ An atom is most stable when its outer most shell is filled Ionic Bonds ­ Ex: NaCL • Bonds are weak • Na gives up an electron to Cl and now has 11 protons and 10 electrons ­ not electrically balanced anymore • Cl accepts an electron from Na and now has 17 protons and 18 electrons • Na has a full second shell and Cl has a full 3rd shell • NaCl falls apart in a solution because of the weak bond ­ Cations­ positive charge ­ Anions (electrolytes)­ negative charge 1 Wednesday, February 3, y Covalent Bonds ­ Ex: CH4 (Methane) • Strong bonds • Do not fall apart in a solution • The 4 hydrogens each give up 1 electron to form electron pairs with the carbons outer shell • Both carbon and hydrogen now have their outer shell filled • Certain atom types have a stronger attraction than others Electronegativity ­ O > N > C = H ­ The greater the electronegativity = the greater the amount of electrons Polar v. Non-polar ­ Polar • Covalent bonds that have electrons that are not shared equally • Molecules tend to be soluble in water • Hydrophilic ­ Non­polar (neutral) • Electron pairs are shared equally • Molecules are not soluble in water • Hydrophobic 2

Step 2 of 3

Step 3 of 3

## Discover and learn what students are asking

Calculus: Early Transcendental Functions : Functions of Several Variables
?In Exercises 15 - 22, find all first partial derivatives. $$f(x, y)=\frac{x y}{x+y}$$

Calculus: Early Transcendental Functions : Differentiation and Integration of Vector-Valued Functions
?Differentiation of Vector-Valued Functions In Exercises 1-6, find r’(t), $$\mathrm{r}\left(t_{0}\right)$$, and $$\mathrm{r’}\left(t_{0}\right)$$ for t

Statistics: Informed Decisions Using Data : Inference about Two Population Standard Deviations
?In Problems 9–14, assume that the populations are normally distributed. Test the given hypothesis. 13. s1 6 s2 at the a = 0.1 level of signif

Statistics: Informed Decisions Using Data : Inference about the Difference between Two Medians: Dependent Samples
?Reaction Time In an experiment conducted online at the University of Mississippi, participants are asked to react to a stimulus such as pressing a key

#### Related chapters

Unlock Textbook Solution