I've attached a screenshot of the question. This is what I've tried so far:
I've calculated the initial energy of the system (which is all potential energy):
Energy of disc:
0.5*I*w^2 + 0.5 *m*v^2 + m*g*h
= 0 + 0 + 0
Energy of arm:
0.5*m*v^2 + m*g*h
= 0 + 4*9.81*1.5Cos(45)
= 41.62...
I got it figured. My problem was that i was splitting the rods. I shouldn't have done that.
I decided just to take the basics of what the solution was telling me, which was to balance forces horizontally and vertically, and take moments about O, and it worked out perfectly.
I was...
Hopefully someone here knows what I'm talking about, but here it goes.
I'm doing my leaving cert applied maths paper in 2 days time, and I'm stuck on this question. I can't follow the solution available on the internet, so i need someone to go through it step by step. Its Q7 in the paper...