Talk:OpenStax University Physics/V1/Equations (master)

Errata in Chapter Summaries

Applies to https://cnx.org/contents/1Q9uMg_a@8.1

• Chapter 3 https://cnx.org/contents/1Q9uMg_a@8.1:IS2yb3Bc@8.1/Chapter-Review

1. formula for average velocity $v_{ave}={\frac {v_{0}+v}{2}}$needs "constant acceleration" caveat.

• Chapter 4 https://cnx.org/contents/1Q9uMg_a@8.1:2cmfxapY@8.1/Chapter-Review

1. Time of flight needs naught-subscript in angle: $T_{tof}=2v_{0}\sin \theta _{0}/v$ (assuming you want to keep the notation consistent with the other formulas)

• Chapter 8 https://cnx.org/contents/1Q9uMg_a@8.1:ekOTjiU6@8.1/Chapter-Review

1. misplaced r-naught in formula for PE wrt rnaught:${\vec {r}}_{0}\Delta U=U({\vec {r}})-U({\vec {r}}_{0})\rightarrow \Delta U=U({\vec {r}})-U({\vec {r}}_{0})$
   
2. Was it your intent to use E as force in equation 8.9? It seems to me that it should be:$\oint {\vec {F}}_{\text{cons}}\cdot d{\vec {r}}=0$

• Chapter 10 https://cnx.org/contents/1Q9uMg_a@8.1:0r653JTW@8.1/Chapter-Review

1. Change the confusing word "initial" to "center of mass" in the parallel axis theorem as per Eqn 10-20: $I_{parallel-axis}=I_{initial}+md^{2}\Rightarrow I_{parallel-axis}=I_{center\,of\,mass}+md^{2}$

• Chapter 15 https://cnx.org/contents/1Q9uMg_a@8.1:AC6sa4C3@8.1/Chapter-Review

1. Forced oscillation amplitude factor of m-squared (not m) in denominator.$A={\tfrac {F_{0}}{\sqrt {m^{2}(\omega -\omega _{0})^{2}+b^{2}\omega ^{2}}}}$ is right. $A={\tfrac {F_{0}}{\sqrt {m(\omega -\omega _{0})^{2}+b^{2}\omega ^{2}}}}$ is wrong.
2. Same error in Eqn,(15.29) at https://cnx.org/contents/1Q9uMg_a@8.1:I8vxzBp3@3/156-Forced-Oscillations

• Chapter 16 https://cnx.org/contents/1Q9uMg_a@8.1:PspzQ7C7@8.1/Chapter-Review

1. Not a typo, but source of confusion: Power in a wave for one wavelength? I suppose you mean power averaged over a wavelength. This is confusing. At a book at this level, I would prefer "Average power", and remain silent as to how it is averaged.

--Guy vandegrift (discuss • contribs) 01:58, 28 December 2017 (UTC)

About the name

I will eventually configure this as OpenStax University Physics/Volume 1, but let me finish volumes two and three first. As I am writing these, I see better ways to set up the transclusions. The upgrade to the new name will fix these issues.--Guy vandegrift (discuss • contribs) 20:11, 16 February 2018 (UTC)