Recent content by kevinf

Homework Statement The problem provides a sequence. Let x(n) ={1,-2,4,6,-5,8,10} where x(-4)=1, x(-3)=-2,etc. Generate x1(n) = 3x(n+2)+x(n+4)-2x(n) The Attempt at a Solution x = [0, 0, 1, -2, 4, 6, -5, 8, 10, 0, 0, 0, 0]; n = -6:6; x1 = x * 3; n1 = n-2; x2 = x * 2; n2 = n; x3 = x; n3 =...

i just want to check if my answer is correct. 10 distinct balls are to be tossed, one at a time, intto 5 distinct bins. find the number of possible outcomes the following case. a) an outcome records only the identity of the bin for each toss (no record of the ball tossed) b) an outcome...

Lol if I understood you correctly, after making t one letter wouldn't there be 7 spots where t could go instead of 6 because t is now one letter

So then it would be 7 possible places that the t could sit in then. Then wouldn't it be 7 x 5! . But what about the repeated a.

sorry but I'm not quite understsanding how i would get the answer that way but it would be 6 ways? and each of the 6 ways have 5! ways of arranging the other letters? or maybe not, since the O's are also repeated. sorry lol can you elaborate on that a little more? sorry

Hi, i have a problem that asks how many arrangements of "TOYBOAT" are there if the T's can not be next to each other. I know the first step is to find the total without the restriction, which is 7!/(2!*2!). the 2 2! represents the repeated letters of T and B but I'm not sure how to make it so...

sorry it was a typo. i corrected it in the original post.

hi in my engineering mathematics class, we are going over surface integrals again. i have some general question about this subject. sorry for not using the template. say that i have a problem that goes like this. "evaluate \int(v*dS) (where the * means dot) where v= (3y,2x^{2},z^{3}) and S is...

but the current in the secondary is coming out of the dot (like going from negative to positive in a voltage source) rather then going in, doesn't that mean that it is a negative mutual inducatance?

thanks for your explanation but i don't think i completely understand it because i am more of a visual person. for example in this circuit, the two currents are going clockwise and the dots are on top but the mesh equations +17j*I_2 and +17j I_1, shouldn't they both be negative...

i have started to use dot convention for magnetically circuit. my understanding is that if the currents for primary winding and current in the secondary winding are clockwise and the dots are ontop of the inductors then the mutual inductance value would be negative because the secondary winding...

i am just starting out as an electrical engineering major but having a bit of trouble already because the textbook sucks. we are currently learning logic gates, boolean algebra, circuit simplification, decoders, adders, etc. are there any good books that can give me extra help in these topics? i...

bump...

Homework Statement In the experiment, you will study an oscillator called a "torsion pendulum." In this case, the restoring "force" is the torsion constant of the wire that suspends the weight X and the inertial term is the rotational inertia of the suspended mass. You will compare the...

so sin(42)/sin(30) = n2/1? so it should be about 1.34 right?