## 11 thoughts on “5.4”

1. Joel Sam says:

On the line right before you started doing Conservation of Energy, it looks like you forgot to make the I1 and I2 terms positive.

2. bbbrranndddoon says:

When you are making your EOM through Newtonian I think the I1 and I2 terms in the final equation should be positive not negative? Our lecturer said that all of those terms should always be positive?

1. bbbrranndddoon says:

oops, didnt see that Joel mentioned this already

3. Travis Greenstreet says:

When you're plugging the numbers in for your differential equation, when I do both masses in snails i get -1.047 for the second part of the equation instead of -12.6, it seems that -12.6 comes about if you do the masses in slugs, but the other part is still in snails, is this just an error or is there a reason for it?

1. tutorpaul says:

What are you using for $g$? Since we're in the Inch-Pound-Second system I opted to use $g=386.4 \frac{\text{in}}{\text{s}^2}$.

4. Jorge Landois says:

shouldn't the differentiation of total energy be with respect to time instead of y?

5. I'm not getting your .155 value but rather .115? When you calculated moment of inertia what values did you use? I'm using the 1/2mR^2 formula and 5 as r, 12 as R for I2, and 5 as R for I1.