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Commits (2)
 ... ... @@ -7,6 +7,7 @@ #+EXCLUDE_TAGS: noexport #+CREATOR: Emacs 25.2.2 (Org mode 9.1.14) #+LaTeX_HEADER: \usepackage{siunitx} $\require{\siunitx}$ * Section Review [1.2] ... ...
 ... ... @@ -7,6 +7,7 @@ #+EXCLUDE_TAGS: noexport #+CREATOR: Emacs 25.2.2 (Org mode 9.1.14) #+LaTeX_HEADER: \usepackage{siunitx} $\require{\siunitx}$ * Chapter 1 Assessment ... ...
 ... ... @@ -7,6 +7,7 @@ #+EXCLUDE_TAGS: noexport #+CREATOR: Emacs 26.1 (Org mode 9.1.9) #+LaTeX_HEADER: \usepackage{siunitx} $\require{\siunitx}$ * Section Review [6.2] ... ... @@ -44,5 +45,32 @@ circle is $4.1 \si{m/s}$, what is the friction necessary to keep her from falling off the platform? \begin{align} F &= \frac{mV^{2}}{r} \\ F &= \frac{45 \cdot 16.81 \si{kgm^{2}/s^{2}}}{6.3 \si{m}} \\ F &= \frac{756.45}{6.3} \si{kgm/s^{2}} \\ F &= 120 \si{N} \end{align} ** [18] If a $40 \si{g}$ stone is whirled horizontally on the end of a $0.6 \si{m}$ string at a speed of $2.2 \si{m/s}$, what is the tension in the string? \begin{align} F &= \frac{mV^{2}}{r} \\ F &= \frac{40 \cdot 4.84 \si{gm^{2}/s^{2}}}{0.6 \si{m}} \\ F &= \frac{193.6}{0.6} \si{gm/s^{2}} \\ F &= 0.322 \si{N} \end{align} ** [20] A bowling ball has a mass of $7.3 \si{kg}$. If you move it around a circle with a radius of $0.75 \si{m}$ at a speed of $2.5 \si{m/s}$, what force would you have to exert on it? \begin{align} F &= \frac{mV^{2}}{r} \\ F &= \frac{7.3 \cdot 6.25 \si{kgm^{2}/s^{2}}}{0.75 \si{m}} \\ F &= \frac{45.625}{0.75} \si{kgm/s^{2}} \\ F &= 60.8 \si{N} \end{align}