Chapter 6 feedback

[salbert83]

1. Typo in formula for \Delta x. Would also be useful to have equation numbers.
2. In code, formulas like t_final .* t_final ./ 2 can be simplified to 0.5t_final.^2. It's a personal choice, but the later highlights Julia syntax features.
3. Plot titles such as, "Posterior distribution for g with uniform distribution" can be clarified to, "Posterior distribution for g with uniform prior".
4. Typo in numerator in solving for g.
5. gravity_angle_uniform can take the \theta passed as an argument instead of the hard coded "45"
6. tan(deg2rad(\theta) can be replaced with tand(\theta)
7. Typo in second equation in derivation of Mar's escape velocity

Thank you again. I'm really enjoying your book.

[unbalancedparentheses]

Thanks!! We will fix all the issues. I am really glad you like our book.