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
 * 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
 * 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
 * misplaced r-naught in formula for PE wrt rnaught:$$\vec r_0\Delta U = U(\vec r)-U(\vec r_0) \rightarrow \Delta U = U(\vec r)-U(\vec r_0)$$
 * 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
 * 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
 * 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.
 * 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
 * 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)