Maths P32 GT and paper discussion

[guest1234]

Can someone tell me the time required for population(N) to double?

t = 49.0

 

[saadgujjar]

what was answer of the differential equation question?? was value of C equal to 50ln[1/4]

i dont remember but first we have to convert in partial fraction and then solve.....in partial i think 1 value is 50 and other is -1/2

 

[guest1234]

ooh i get it now thanks. it was freakin wasy.. i was just harrased :/
and what about that complex no did you get itan(theta)

That part involved some tedious working, which was prone to algebraic errors. You just needed to express the complex number in polar form and then multiply the denominator and numerator with the conjugate of the denominator. After some pathetic amount of working, you had to apply the identities sin2x = 2(sinx)(cosx) AND cos2x = 2(cosx)^2 -1. That would finally give you the answer. But I think that question wasn't worth 4 marks. It was more.

 

[A star]

That part involved some tedious working, which was prone to algebraic errors. You just needed to express the complex number in polar form and then multiply the denominator and numerator with the conjugate of the denominator. After some pathetic amount of working, you had to apply the identities sin2x = 2(sinx)(cosx) AND cos2x = 2(cosx)^2 -1. That would finally give you the answer. But I think that question wasn't worth 4 marks. It was more.

yeah i got to much near it wasted quater of an hour on it

 

[Shehroze Faisal]

i dont remember but first we have to convert in partial fraction and then solve.....in partial i think 1 value is 50 and other is -1/2

sir i think the values were 1 and 1/2, maybe u r right, because only 2-3 people in my centre got the same answer as mine!!
and it would be appreciated if some brother solves the dif.....equation dN/dt=0.02N(1-0.01N)

 

[A star]

sir i think the values were 1 and 1/2, maybe u r right, because only 2-3 people in my centre got the same answer as mine!!
and it would be appreciated if some brother solves the dif.....equation dN/dt=0.02N(1-0.01N)

bro it depends on what you made the two partial fractions from it doesnt matter it should both lead to the right equation

 

[guest1234]

dN/dt = 0.02N(1-0.01N). N was 20 when t was 0.
Can someone solve the differential equation PLEASEE?

t = 50ln(0.8N/20(1-0.01N))

 

[guest1234]

sir i think the values were 1 and 1/2, maybe u r right, because only 2-3 people in my centre got the same answer as mine!!
and it would be appreciated if some brother solves the dif.....equation dN/dt=0.02N(1-0.01N)

t = 50ln(0.8N/20(1-0.01N))

 

[A star]

t = 50ln(0.8N/20(1-0.01N))

if you found out the value of C wrong and left it in the unsimplified form (not in terms of t) how many would you get and i think it asked Nin terms of t :/

 

[guest1234]

if you found out the value of C wrong and left it in the unsimplified form (not in terms of t) how many would you get and i think it asked Nin terms of t :/

You may get 4-6 out of 8. But now is not the right time to rue over what you've done. Pray to Allah for a good grade and prepare for the upcoming papers. You'll get what you deserve. InshaAllah.

 

[A star]

You may get 4-6 out of 8. But now is not the right time to rue over what you've done. Pray to Allah for a good grade and prepare for the upcoming papers. You'll get what you deserve.

dude its hard when you toiled and did 12 feakin years of past paper and then for this to hapen get 60+ in all the practice papers :/

 

[Shehroze Faisal]

t = 50ln(0.8N/20(1-0.01N))

i doubt that

 

[guest1234]

i doubt that

Solve it for yourself then. I could be wrong. Solve it and then let me know.

 

[Shehroze Faisal]

Solve it for yourself then. I could be wrong. Solve it and then let me know.

why so serious

 

[guest1234]

why so serious

You're in chill mood Leave this discussion for later.

 

[Thought blocker]

Mera frnz ka bohot acha gaya hai I am happy

 

[Lostsoul]

I messed up differential part too. I took wrong partial fraction format but my method and Integrating way was right. That means my C is wrong so is the N
How much will I get out of 8 as well as for the 3rd part?

 

[Lostsoul]

When solving the differential:
The partial fraction:

N= A/0.02 + B/1-0.02N

And the RHS = 0.02t?

I did that, went on with this wrong equation, got wrong values
How much am I goig to score?
Someone please helppppppp
Just kill my curiosity
How much ouy of 8 eill I score?

 

[Yousef123]

guys in the differential eq he wantted t in terms of N or N in terms of T? :/

 

[saimcfc178]

What was the answer of complex no question part i and vectors part i?