Recent content by jghlee

First off, thanks for reply! So basically the sure way of knowing what the cut-off frequency is essentially using the cutoff frequency definition where H(jw) = Hmax / (root 2). This leads me to another question. What are the purposes of these "general" equations like H(s) = (R/L) / [s + (R/L)]...

So this is a pretty general question regarding the cut-off frequency for any filter. In my study of filters, I've come across certain equations that the book gives for wc. For example, Low/High Pass filters have wc = 1/(RC) or R/L, and Bandpass/stop filters have the center frequency wo^2 =...

Homework Statement So when it comes to finding the zero force members, am I correct in assuming that any member previously eliminated will cease to act as a member for a point? http://img402.imageshack.us/img402/603/47362170.th.jpg so for example we know that IJ is a zero force member...

Okay guys, I think I got it... Here's my work: Mc = 0 = (1.5m)(-400N) + (2.5)(Bcos30) + (-1.2)(Acos45) Fy = 0 = (-400) + (Bcos30) + (Acos45) + T Fx = 0 = (Bsin30) + (Asin45) A = -152.3355 B = 215.4349 T = 321.15 I can't help but feel like I did wrong cause the answer is so specific but I...

so there's the reaction force of point a, reaction force of point b, tension force of the rope, and the 400N force. so a total of 4 unknowns when one known. Fy = 0 = -400N + Ay + T + By Fx = 0 = Ax + Bx M(@ rope) = (-1.2)(Ay) + (1.5)(-400N) + (2.5)(By) which seems to be unsolvable...

Homework Statement The entire problem can be found in this image link. http://www.freeimagehosting.net/image.php?58acd0e92b.jpg Homework Equations Equilibrium so the usual: Total F = 0, Total moment = 0 The Attempt at a Solution I'm not sure how we're supposed to find out the...

thanks for the help LowlyPion

So, just to make sure I'm on the right page here, we can basically consider the conducting cylinder as a really thick line charge?

Homework Statement So here's the question... A cylindrical shell of radius 7.00 cm and length 240 cm has its charge uniformly distributed on its curved surface. The magnitude of the electric field at a point 19.0 cm radially outward from its axis (mesaured from the midpoint of the shell) is...

I'm bringing back a really old question but it just happens that I have the same HW question... I understand that the graph of simple harmonic motion is sin/cos, and the highest point corresponds to the 20 cm and then half of that will be 10 cm. But how do i figure out the time from that alone?

I'm still having trouble doing this problem. I don't seem to find any equation where I can incorporate the different values given in the question. Can anybody help me?

Homework Statement A 45.0-g hard boiled egg moves on the end of a spring with a force constant k = 2.50 N/m. Its initial displacement is 0.500 m. A damping force Fx = -bvx acts on the egg, and the amplitude of the motion decreases to 0.300 m in 4.0 s. Calculate the magnitude of the damping...

So even if there's a weight at the end of the plank, the center of gravity will still be at (L/2)?

Homework Statement A uniform wooden plank of length L = 6.0m and mass M = 90kg rests on top of two sawhorses separated by D = 1.5m, located equal distances from the center of the plank. Your cousin Throckmorton tries to stand on the right-hand end of the plank. If the plank is to remain at...

Homework Statement This is the problem: http://session.masteringphysics.com/prob ... A squar emetal plate .180 m on each side is pivoted about an axis through point O at its center and perpendicular to the plate. Calculate the net torque about this axis due to the three forces shown in the...