Recent content by slain4ever

not sure about those formulas is this working right? E_a = (k_m)(W_m) V_T = E_a + (I_a)(R_a) No load test, therefore I_a = 0 Therefore E_a = V_T V_T/Wm = k_m k_m = 239/(3000*(1/60)*2pi = 0.76

ok I found this site which helped a lot, something about a conversion factor for the torque so i managed to get a bit further but I am still confused about those two differing formulae T Nm * 3000RPM * 0.1047 (conversion factor) = P T * 3000 * 0.1047 = 239 * 0.25 T = 59.75 / 314.1 T = 0.190226...

Homework Statement Given the no-load test results of a DC motor connected in shunt to be: Speed: 3000rpm Applied voltage: 239V Field current: 0.25A Calculate the motor constant K_m, where K_m = K Homework Equations not really sure about the equations to use i have these: Km = T/...

f= ma 0.5 kg * 5 m/s^2 =2.5 N

Homework Statement i'm having a lot of trouble with this question. A pulley, consisting of a 0.40 m diameter wheel mounted on a horizontal frictionless axle, is firmly attached to the ceiling. A light rope wrapped around the pulley supports a 0.50 kg object, as shown in the diagram...

bump?

the gates have the right number of iputs and outputs I just didn't put the weird shapes, because it's easier for me to remember like this

oh right, that makes sense, so it would be something like this right? http://screencast.com/t/zIp1V3Lmt sorry about my handwriting.

Homework Statement The costs (in millions of dollars) of connecting any two of the four cities A,B,C and D by telephone lines are given in the following matrix: 0 3 5 4 3 0 2 3 5 2 0 6 4 3 6 0 a) Draw a diagram of the complete graph b) find a minimal spanning tree The...

Homework Statement Draw a logic circuit for the boolean function ((p+qr)')(pq+r) do not simplify the function first The Attempt at a Solution I got this: http://screencast.com/t/BC4akgo9J but I'm pretty sure it's wrong because of the first part how the bar goes over the whole...

i've decided to just write expressions for each of the members can you please tell me which ones I need to change to negative. BG =25 AC = 35 CJ = -49.497 CD = 35 DJ = 65 JK = 35 DK = -91.924 DE = -(35 + -91.924* sin(45)) 0 = DK sin(45) + KF sin (45) - 20 0 = JK + KL + DK sin(45) + KF sin(45)...

i've calculated F(CD) to be 35 and F(DJ) = 65 F(JK) =35 and F(DK) = 91.924 i have no idea if they are negative or what

if it is in compression does that mean its negative? or is it the other way around? also we were told that CH, HJ, EK, GM and LM are zero force members

the equation should be 0=F(CJ) * Cos(45) + F(CD) right? how do you tell if it is + or - ?? like is it what I wrote above or 0=F(CJ) * Cos(45) - F(CD)??

Homework Statement Hi so I have the following truss: http://screencast.com/t/BIdagRt5abg and I need to calculate the forces in every member by method of joints The Attempt at a Solution So I got the Reaction forces: F(BG) = 25N and F(AC) = 35N Now I'm not exactually sure what to do...