Recent content by pivu0

I have made a mistake in OP, I ment that H(s) is the impulse reponse in s, not the unti response! So, one can say that because there is only 1 pole in s = 0, the H(s) is 1/s ? U(s) is also 1/s, You say that convolution is multiplication in freq domein, do you mean S(s) = H(s)*U(s) ? So that...

Homework Statement A contininous time system has when laplace transformed, a pole in s = 0. What is de stepresponse for the system when t goes to infinity Homework Equations H(s) is infinity in 0 (H(s) is unit response laplace transformed) s(t) = h(t) * u(t) (the stepresponse is the...

So the awnser to the sum of sin² is 45 right? the smallest n! for 00 is 11, so I just have to add the first 10! Thank you.

I'm not English so I don't know what you mean with "Use the double angle trig identity for sin^2". Ok, so 2006! last two numbers are 00. But the problem is, I also have to add 1! up to 2005!

15! is 120 and 16! 136, so it seems that 136-120 is 16. So 2006!-2005! is 2006. However I still don't get how to get the last two numbers of the sum of all !'s until 2006. And with the Cos part, I don't really get what you mean. I just want to know how to calculate these sums without a...

Sorry Its sin². The second sum ends with +2006!, not with n

Homework Statement sin²(1°)+sin²(3°)+sin²(5°)+...sin²(359°)= ? And : 1!+2!+3!+4!+...+2006!, asked are he last two numbers of this sum. Homework Equations I don't know anyThe Attempt at a Solution I don't know how to calculate Sin with your head, and 2006! is way to hard to calculate. Is...

Thank you all! It's not that hard if you think about it. It's just that I'm used to using a equation directly after hearing a problem, I should first think it easy, Like the 1.5s= t1+t2 and that they both have the same x...

Yes I do :) It takes the coin 1.469 s to reach the bodom and the sound does 0.031s for reaching the top again! The well is 10.59m deep :)

Anyone? Is this correct?

x= 0+0+(9.81*t1²)/2 x=t2*speed of sound x=x (9.81*t1²)/2=t2*speed of sound so (9.81*t1²)/ (2*speed of sound)= t2 1.5s= t1+t2 1.5s= t1 + ((9.81*t1²)/ (2*speed of sound) Like this?

Homework Statement You throw a coin into a well, 1.5 seconds later you hear a splash the acceleratoin is g, 9.81 m/s², the beginnig speed is 0 Homework Equations x= x0 + v0t + (at²)/2 The Attempt at a Solution x= 0+0+ (9.81*1.5²)/2 x= 11.04 m Yet this is not the...