Recent content by SF2K4

Homework Statement The pressure and temperature at the beginning of compression in an air-standard Diesel cycle are 95 kPa and 300K. At the end of the head addition process, the pressure is 7.2 MPa and 2150 K. Assume variable specific heats. I'm not going to list the parts because all...

Could you possibly set up an example problem for me? I'm not at the lab at the moment to use MATLAB but I'd like to see it now so I can know what I'm looking for tomorrow. I'd just like to see the code so I can read thru it.

Ok, so while I understand 2nd Order ODEs... I really don't understand MATLAB. I have 2 questions that I just can't get any code to work for: 1 Question: Consider the model of an undampened spring-mass system with a time-dependent spring constant k(t) given by: d2y/dt2 + k(t)y = 0...

But then wouldn't I be left with something like: d_x = v^i cos\theta t Which would result in: t = \frac{d_x}{v^i cos\theta} And after using sin^2\theta + cos^2\theta = 1 I should be able to use a quadratic formula to get two values of t... but I only end up getting one and it doesn't result...

The equations I have are: dx = vxit vyf = vyi + at dy = vyit + (1/2)at^2 However, t is unknown and vyi and vxi are all dependent on theta...

The horizontal distance is 1.27mm... but there are two vertical distances depending on the angle theta...

Homework Statement Ok, so, I've about had it rattling my brain on this. I'm stumped. Q: Protons are projected with an initial speed vi = 9.89x10^3 m/s into a region where a uniform electric field E = (-720 j) N/C is present. The protons are to hit a target that lies at a horizontal...