Plz help me to select correct option

Printable View

- Dec 15th 2011, 01:13 PMmoonnightingaleHow to find x(0) for X(s)
Plz help me to select correct option

- Dec 15th 2011, 01:28 PMAckbeetRe: How to find x(0) for X(s)
Use the Initial Value Theorem (scroll down).

- Dec 15th 2011, 01:43 PMmoonnightingaleRe: How to find x(0) for X(s)
Thanks can u kindly further explain and tell me answer

i am getting infinity/infinity

plz guide me - Dec 15th 2011, 02:50 PMmoonnightingaleRe: How to find x(0) for X(s)
I have solved it with initial value theorem , kindly cross check it

s^2 (s^-1+10s^-2) / s^3 (1+s^-2+4s^-3)

now sF(s)

i am left with

(s^-1+10s^-2) / s^3 (1+s^-2+4s^-3)

and now putting s--->infinity

0/1= 0

**so x(0) = 0 Is this correct answer plz tell me** - Dec 16th 2011, 03:00 AMAckbeetRe: How to find x(0) for X(s)
You have the correct answer, but I'm not so sure about your method. You must compute

$\displaystyle \lim_{s\to\infty}\frac{s(s+10)}{s^{3}+s+4}=\lim_{s \to\infty}\frac{s^{2}+10s}{s^{3}+s+4}=\lim_{s\to \infty}\frac{s^{-1}+10s^{-2}}{1+s^{-2}+4s^{-3}}.$

Now you can conclude what you concluded. - Dec 16th 2011, 05:23 AMmoonnightingaleRe: How to find x(0) for X(s)
Thanks a lot