Applied Mathematics Laplace Transforms
1. Consider a smooth function f(t) defined on 0 t<o, with Laplace transform F(s) (a) Prove the First Shift Theorem, which states that Lfeatf(t)) = F(s-a), where a is a constant. Use the First Shift Theorem to find the inverse trans- form of s2 -6s 12 6 marks (b) Prove the Second Shift Theorem, which states that L{f(t-a)H(t-a))-e-as F(s), where H is the Heaviside step function and a is a positive constant. Use the First and...
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(1 point) The graph of f(t) is given below (Click on graph to enlarge) a. Represent f(t) using a combination of Heaviside step functions. Use h(t - a) for the Heaviside function shifted a units horizontally f(t) = help (formulas) b. Find the Laplace transform F(s) = L {f(t)) for s 0. F(s) = L {f(t)) = help (formulas) (1 point) Find the inverse Laplace transform of 7s F(s) = s2-15-12 f(t)-H(t-7)*(1/7% . (Use step(t-c)...
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Obtain the inverse Laplace transform f () for the following: 2.8 5 6 4s a. $2+9 $2+4 s2+4 5 6 d. s(s +3) 2s +8 с. s2+4s+ 13 10 f. (s+3)(s+7 е. (s+3)(s +7)
2. Given 12 f(t)= ={ Ost<3 t23 (a) Write f(t) in one line using the unit step function (Heaviside function). 5 points 10 points (b) Find L{f(t)}, either by using the definition of the Laplace transform or by finding the Laplace transform of your answer to part (a).
(1 point) Find the inverse Laplace transform f(t) = C-' (F(3)) of the function F(s) = 45 52 - 16 f(t) = -1 { 4s s2 - 16 } help (formulas) (6+4+2}- Preview My Answers Submit Answers
Problem #9: The graph of f(t) is given below. 5 4 3 2 2 10 4 -1 1 (a) f() can be represented using the following combination of Heaviside step functions а U(t - 3) + b U(t - 4) + с U(t - 9) Enter the constants a, b, and c (in that order) into the answer box below. (b) Find the Laplace transform F(s) = Pf()} for s 0. a, b, c (in that order), separated with commas....
f(t) F(S) (s > 0) S (s > 0) n! t" ( no) (s > 0) 5+1 T(a + 1) 1a (a > -1) (s > 0) $4+1 (s > 0) S-a 1. Let f(t) be a function on [0,-). Find the Laplace transform using the definition of the following functions: a. X(t) = 7t2 b. flt) 13t+18 2. Use the table to thexight to find the Laplace transform of the following function. a. f(t)=t-4e2t b. f(t) = (5 +t)2...
Q3 Find the inverse Laplace transform for the following expression [20] i. F(s) 10 4s +11 s2+118+10 65° +105+2 $3+352 +2s ii. F(S) 10
2. Use the property f(t) = L-1 {r(s))-(-1)"L-1 {F(n)(s)} (-t)n and choose n = 1 to perform the following inverse Laplace transform L-1 (F(s)): (1). F(s)=ln-s-3 V s + 1 (Answer:- (e3t-le-t) ) (2). F(s) - arctan(2s) (Answer: tsin )
2. Use the property f(t) = L-1 {r(s))-(-1)"L-1 {F(n)(s)} (-t)n and choose n = 1 to perform the following inverse Laplace transform L-1 (F(s)): (1). F(s)=ln-s-3 V s + 1 (Answer:- (e3t-le-t) ) (2). F(s) - arctan(2s) (Answer: tsin )
Integral Transform
Find the Laplace transform for the periodic function f(t) = f(t+2) and f(t) = t for 0 <t< 2.