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# 5.5

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When you did the step d/dtheta, you got theta dot squared turns into two theta double dot, but on the second half with the spring constant, theta squared became two theta and didn't turn into two theta DOT like I would have expected. Can you explain why this is?

Never mind, I figured it out. Energy Integral substitution.

5.5 in 11th

Why did you solve M_1 and M_2 for slugs instead of snails?

I used slugs because the problem was stated in the Foot-Pound-Second system, and the slug is appropriate unit of mass for the Foot-Pound-Second system. The snail is appropriate for the Inch-Pound-Second system.