Recent content by lordy12

Homework Statement The motion of an undamped mass-spring system is described by the differential equation 2x" + 36x = sin(wt) a) For what values of w will the system exhibit resonance? b) Use the method of undertermined coefficients to find a particular solution in the case where w is not...

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1. http://d.imagehost.org/t/0866/problem1.jpg Homework Equations 3. For the Poisson random variables I get ((lamda)^x)/((e^2lambda)*x!) when y =1. Is this a Poisson Random variable? Also, when y = 0, I get ((lamda)^x)/((e^lambda)*x!) - ((lamda)^x)/((e^2lambda)*x!) I cannot get the...

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1. The problem is attached Homework Equations 3. We can express S as the sum of the product of two Bernoulli random variables, X and Y. Then S = summation(i,m)XiYi

1. How does [((n+1)+2)/2^(n+1)]= [((n+1)/(2^(n+1)) + (n+2)/(2^n))? 2. For example: (a+b)/x = a/x +b/x 3. Likewise, (n+1)+2/2^(n+1) = n+1/2^(n+1)) + 2/2^(n+1). How does the previous expression equal n+1/2^(n+1)) + 2/2^(n+1) when 2/2^(n+1) does not equal 2/(n+1)?

http://www.winwenger.com/imstream.htm Does this work?

Say you are given a five-sided biased die that has a probability of 1/8 of coming up A, 1/8 for B, and 1/4 for each of C, D, and E. Design an optimal code for transmitting throws of this die. log(5) = 2.32, so 2.32 bits are required to transfer one throw of the die. But if we encode as...

guic

why does this happen?

When two rays of different colors of light cross each other what color is projected on the wall? Say for example, red light, and green light cross each other, what is the ultimate color projected on the wall? Why don't the colors get mixed up?

1. You have a bank account that earns 4% interest per year. You earn $4500 per year designing web pages for local businesses and spend $5000 buying CD's and computer games. a.) Find differential equation that models account t years from now, A(t). b) If A(0) = 10,000 how much money will be in...

1. Given b = (-2,3,7), u1= (4,-1,5) and u2= (3,1,3) and u3 = (5,02), determine if vector b is in the span of the remaining vectors Homework Equations 3. You just solve for three equations with three unknowns? -2x + 4y + 3z = 5, 3x - y + z = 0, 7x + 5y + 3z = 2

I did well on all previous tests but I did terrible on this one. I really wanted to major in computational finance, but now I'm stuck with a major I don't like. I don't know what to do. One test shouldn't determine my ultimate fate.

what exactly is a quotient set? I know it "partitions" a large group of numbers into discrete subsets but I still don't know what exactly it is in practical terms. Like, does it relate somehow to Euler's phi function?