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Quiz 2: properties of LT

Total questions: 15

Worksheet time: 45mins

Name
Class
Date
1.


 Laplace transform of e3t12Laplace\ transform\ of\ e^{3t}-\frac{1}{2}  

a)

 1s+312s\frac{1}{s+3}-\frac{1}{2s}  

b)

 1s32s\frac{1}{s-3}-\frac{2}{s}  

c)

 1s312s\frac{1}{s-3}-\frac{1}{2s}  

d)

 12(s3)\frac{1}{2\left(s-3\right)}  

2.

 L[e2tsin3t]L\left[e^{-2t}\sin3t\right]  

a)

 L[sin3t], ss+2L\left[\sin3t\right],\ s\rightarrow s+2  

b)

 L[sin3t], ss2L\left[\sin3t\right],\ s\rightarrow s-2  

3.

 f(t)=te2tf\left(t\right)=te^{-2t}  

a)
b)
c)
d)
4.

 L[e5tcos3t]L\left[e^{5t}\cos3t\right]  

a)
b)
c)
d)
5.

Define this property:  L(f(t)eat)=F(sa)L\left(f\left(t\right)e^{at}\right)=F\left(s-a\right)  

a)

Linearity Property

b)

First Shifting Property

c)

Convolution Theorem

d)

Second Shifting Property

6.

Define this property:  L(f(t)eat)=F(sa)L\left(f\left(t\right)e^{at}\right)=F\left(s-a\right)  

a)

Linearity Property

b)

First Shifting Property

c)

Convolution Theorem

d)

Second Shifting Property

7.

 L(e2t sin t)L\left(e^{2t\ }\sin\ t\right)  What is  aa   and f(t)?

a)

 a=2, f(t)=e2ta=2,\ f\left(t\right)=e^{2t}  

b)

 a=4, f(t)=cos ta=4,\ f\left(t\right)=\cos\ t  

c)

 a=2, f(t)=sin ta=2,\ f\left(t\right)=\sin\ t  

8.

Find  L(e3t(t33t2+5t))L\left(e^{3t}\left(t^3-3t^2+5t\right)\right)  

a)

 2(s3)4(3((s3)3))+5(s3)2\frac{2}{\left(s-3\right)^4}-\left(\frac{3}{\left(\left(s-3\right)^3\right)}\right)+\frac{5}{\left(s-3\right)^2}  

b)

 6(s3)4(6(s3)3)+5(s3)2\frac{6}{\left(s-3\right)^4}-\left(\frac{6}{\left(s-3\right)^3}\right)+\frac{5}{\left(s-3\right)^2}  

c)

 2(s3)3(3(s3)(2))+5s3\frac{2}{\left(s-3\right)^3}-\left(\frac{3}{\left(s-3\right)^{\left(2\right)}}\right)+\frac{5}{s-3}  

9.

 L(t cos 6t)L\left(t\ \cos\ 6t\right)  Which Laplace property is use to solve this?

a)

Linearity Property

b)

Derivative of Laplace Transform

c)

First Shifting Property

d)

Second Shifting Property

10.

 L(t sin 4t)L\left(t\ \sin\ 4t\right)  What is n, f(t) and L[f(t)]?

a)

 n=1, f(t)=sin 4t, F(s)=4s2+16n=1,\ f\left(t\right)=\sin\ 4t,\ F\left(s\right)=\frac{4}{s^2+16}  

b)

 n=4, f(t)=t, F(s)=4s2+16n=4,\ f\left(t\right)=t,\ F\left(s\right)=\frac{4}{s^2+16}  

c)

 n=1, f(t)=cos 6t, F(s)=ss2+14n=1,\ f\left(t\right)=\cos\ 6t,\ F\left(s\right)=\frac{s}{s^2+14}  

11.

What is the formula for Laplace First Order Derivative?

a)

L(𝑓(𝑡))=𝑠𝐹(𝑠)𝑓(0)ℒ\left(𝑓′(𝑡)\right)=𝑠𝐹(𝑠)−𝑓(0)

b)

L(𝑓"(𝑡))=𝑠2𝐹(𝑠)𝑠𝑓(0)𝑓(0)ℒ\left(𝑓"(𝑡)\right)=𝑠^2𝐹(𝑠)−𝑠𝑓\left(0\right)−𝑓′\left(0\right)

c)

L(𝑓(𝑡))=𝑠2𝐹(𝑠)𝑓(0)ℒ\left(𝑓′(𝑡)\right)=𝑠^2𝐹(𝑠)−𝑓(0)

12.

Given  g(t)=t3f(t)g\left(t\right)=t^3f\left(t\right)  , what is G(s)?

a)

 G(s)=F(s3)G\left(s\right)=F\left(s-3\right)  

b)

 G(s)=(1)3d3F(s)ds3G\left(s\right)=\left(-1\right)^3\frac{\text{d}^3F\left(s\right)}{\text{d}s^3}  

c)

 G(s)=F(s+3)G\left(s\right)=F\left(s+3\right)  

d)

 G(s)=(1)2d2F(s)ds2G\left(s\right)=\left(-1\right)^2\frac{\text{d}^2F\left(s\right)}{\text{d}s^2}  

13.

What is the formula for Laplace Second Order Derivative?

a)

L(𝑓(𝑡))=𝑠𝐹(𝑠)𝑓(0)ℒ\left(𝑓′(𝑡)\right)=𝑠𝐹(𝑠)−𝑓(0)

b)

L(𝑓"(𝑡))=𝑠2𝐹(𝑠)𝑠𝑓(0)𝑓(0)ℒ\left(𝑓"(𝑡)\right)=𝑠^2𝐹(𝑠)−𝑠𝑓\left(0\right)−𝑓′\left(0\right)

c)

 L(𝑓"(𝑡))=𝑠2𝐹(𝑠)𝑓(0)ℒ\left(𝑓"(𝑡)\right)=𝑠^2𝐹(𝑠)−𝑓(0) 

14.

f(t)=sinh 4t, F(s)=?

a)

as2a2\frac{a}{s^2-a^2}

b)

as2+a2\frac{a}{s^2+a^2}

c)

4s216\frac{4}{s^2-16}

d)

4s2+16\frac{4}{s^2+16}

15.

Given  g(t)=f(t)tg\left(t\right)=\frac{f\left(t\right)}{t}  , what is G(s)?

a)

 G(s)=sF(u)duG\left(s\right)=\int_s^{\infty}F\left(u\right)du  

b)

 G(s)=(1)dF(s)dsG\left(s\right)=\left(-1\right)\frac{\text{d}F\left(s\right)}{\text{d}s}  

c)

 G(s)=sF(u)duG\left(s\right)=\int_{\infty}^sF\left(u\right)du  

d)

 G(s)=(1)1dF(s)dsG\left(s\right)=^{\left(-1\right)^{-1}}\frac{\text{d}F\left(s\right)}{\text{d}s}