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ASSESSMENT ACTIVITY FRONT SHEET Learner name Course titleBTEC Higher National Diploma in Mechanical Engineering-VT720 Assessor name Internal Verifier name DateUnit number and title 1. Analytical Methods for Engineers – A/601/1401Assignment title A01: ‘Algebraic Methods’ ‘ Trigonometric Methods” Group workNOOutcome number(s) and statement(s)1 Analyse and model engineering situations and solve problems using algebraic methods. 2 Analyse and model engineering situations and solve problems using trigonometric methods. Date setHand-in dateReview dates123 Learner declaration I confirm that the work submitted for this assignment is my own.Learner signatureDate Introduction Purpose/aimsThis assignment provides the student with the opportunity to acquire knowledge of a range of mathematical techniques such as properties of trigonometric functions, solving systems of algebraic equations and techniques of calculus to determine maximum and minimum values and how these techniques can be applied to solve engineering problems.Background or scenarioYou are a new employee in an auto manufacturing company working as a trainee. Your employer has asked you to do the following tasks and to prepare a computer – processed assignment report showing all intermediate steps. No hand-written work will be accepted. Tasks Task #TaskCriteria covered11.1 Determine the quotient and the remainder for algebraic fraction whenever the fraction is in improper form, and reduce algebraic fraction to partial fractions. 1.2 Solve the following engineering problems: a) Consider a circuit with resistance R (Ohm), inductance L (Henry) and an initial current of i0 (Ampere). The current i(t) will decay with time t (second), according to the law . Calculate the current when t= 1.7 given i0=14, R=4 and L=8. b) The...



Answered Same DayDec 21, 2021

Answer To: assig information Self-documentation of work with references to literature sources. Writing with...

David answered on Dec 21 2021
115 Votes
1.1.Determine the quotient and remainder of the following algebraic fractions and reduce the
remaining proper fraction to a sum of partial fractions.
a)
2
5 1
2
x
x x

 
Since the degree of the numerator is less than the degree of the denominator, we see
that the above algebraic fraction is proper, i.e., the quotient is 0 and the remaind
er is
5 1x .

Now to compute its partial fraction expansion, we first need to factor the
denominator. We have

  2
5 1 5 1
2 1 2
1 2
x x
x x x x
A B
x x
 

   
 
 
for some constants A and B. Multiplying both sides by   1 2x x  , we obtain
   
   
5 1 2 1
2
2 .
x A x B x
Ax A Bx B
A B x A B
    
   
   
Equating corresponding coefficients, we obtain the following linear system:

5;
2 1.
A B
A B
 
 
Adding these equations, we obtain
3 6,A 
whence
2.A 
Plugging this value into the first equation, we obtain
2 5,B 
whence
2.B 

Thus we have the following partial fraction expansion:

2
5 1 2 3
.
2 1 2
x
x x x x

 
   
b)
2
2
2 8 7
.
5 6
x x
x x
 
 
Since the degrees of the numerator and denominator are equal, the quotient is equal to
the quotient of the coefficient of the numerator and the coefficient of the
denominator, which is 2 /1 2. Now we have
 2 2
2 2
2 8 7 2 5 6
2 8 7 2 10 12
2 5.
x x x x
x x x x
x
    
     
  
Thus, the quotient is 2 and the remainder is 2 5x  , whence
  
2
2 2
2 8 7 2 5
2
5 6 5 6
2 5
2 .
2 3
x x x
x x x x
x
x x
  
 
   

 
 
Next we write

  
2 5
.
2 3 2 3
x A B
x x x x

 
   
Multiplying both sides by   2 3x x  , we obtain
   
   
2 5 3 2
3 2
3 2 .
x A x B x
Ax A Bx B
A B x A B
    
   
   

Equating corresponding coefficients, we obtain

2;
3 2 5.
A B
A B
 
 
Multiplying the first equation by 3, we obtain
3 3 6.A B 

Subtracting the second equation from this one yields
1.B 

Substituting this equation into the first one, we obtain
1 2,A 
whence
1.A

Thus we have

  
2 5 1 1
,
2 3 2 3
x
x x x x

 
   
whence

2
2
2 8 7 1 1
2 .
5 6 2 3
x x
x x x x
 
  
   
1.2.We wish to solve the following engineering problems:
a) Consider an RL circuit with resistance R, inductance L, and an initial current of 0.i The
current decays according to the formula
  /0 .
Rt Li t i e
We wish to calculate the current after 1.7st  given 0 14A,i  4 ,R   and 8H.L 
We have
 
  
/
0
4 1.7 /8
14
5.98A.
Rt Li t i e
e





b) The curve assumed by a heavy chain or cable is

cosh .
x
y C
C

If 60,C  we wish to calculate the value of y when 120.x 
We have
cosh
120
60cosh
60
60cosh 2
225.73.
x
y C
C




c) We are given a time-varying current  i t given by

   35cos 0.7 , 0.i t t t  

We wish to find the time t in which the current is first zero.
We have
   35cos 0.7 0,i t t  

whence
 cos 0.7 0.t  

Thus we have

2
0.7 ,t  
whence

2
0.7
2.27s.
t  

1.3.We wish to solve the following scientific problems which involve arithmetic and geometric
series:
(I) A lathe tool has to accommodate work between 25 mm and 300 mm in diameter. Six
spindle speeds are required and the cutting speed is to be 25...
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