Using Matlab to solve dynamics problem

by spin360
Tags: dynamics, matlab, solve
spin360 is offline
Apr19-08, 09:00 AM
P: 16
I've attached my problem set. I'm having an issue on how to write the formula to insert it into matlab. According to the problem set, dl/dt = 0.2m/s. I actually have the "solution" to the problem, though I don't understand why the answer is what it is. Basically, my instructor used the pythagorean theorem and set l[tex]^{2}[/tex] = b[tex]^{2}[/tex] + [tex]^{2}[/tex]. He then differentiated twice w.r.t time, hence dc/dt going to 0 (c is constant) and the second derivative of dl/dt going to 0 as well (dl/dt constant). The end result is d[tex]^{2}[/tex]b/dt[tex]^{2}[/tex] = (dl/dt)[tex]^{2}[/tex] - (db/dt)[tex]^{2}[/tex]. a (acceleration) is the second deriv of b evidently. Can anyone tell me the reason behind differentiating twice, also how I could possibly use that formula in matlab? Thanks.
Attached Thumbnails
Phys.Org News Partner Science news on
Going nuts? Turkey looks to pistachios to heat new eco-city
Space-tested fluid flow concept advances infectious disease diagnoses
SpaceX launches supplies to space station (Update)

Register to reply

Related Discussions
how do you solve problem you cannot solve? Academic Guidance 16
how to use solve function in matlab in this case Math & Science Software 0
dynamics: solve both trajectories General Engineering 3
Who can use MatLab/Mathematica/Maple to solve this? Math & Science Software 4
problem to solve this integral in matlab Math & Science Software 1