Mathematics: Post your doubts here!

[smzimran]

r u sure? Im pretty confused? So we find the constants twice in 2 integration?

Yes, im 100% sure.
Yes, we do that, but indefinite integration does not come for 2 times integrating!

 

[Nibz]

i have a mechanics question ( M1) may june 2006​

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question 5, the first part. from where did the mark scheme get the cos 45 from? :S:S:S​

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http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s06_qp_4.pdf​

It's the horizontal component of the Tension 'T' in the string.

 

[Most_UniQue]

Yes, im 100% sure.
Yes, we do that, but indefinite integration does not come for 2 times integrating!

wts that? indefinite integration? When we take limits?

 

[Most_UniQue]

Yes, im 100% sure.
Yes, we do that, but indefinite integration does not come for 2 times integrating!

Q 7(ii) , they havent found the constan in second integration :

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_w08_qp_4.pdf

ms:

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_w08_ms_4.pdf

 

[Nibz]

Q 7(ii) , they havent found the constan in second integration :

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w08_qp_4.pdf

ms:

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w08_ms_4.pdf

It's because when you take limits, there is no constant involved. And 2.5 and0 are our limits in 7(ii) integration.

 

[smzimran]

wts that? indefinite integration? When we take limits?

Indefinite is when we do not take limits like the one i just did for you.

Definite is the one in which we take limits

 

[Most_UniQue]

It's because when you take limits, there is no constant involved. And 2.5 and0 are our limits in 7(ii) integration.

Indefinite is when we do not take limits like the one i just did for you.

Definite is the one in which we take limits

Ok its clear now tnx

 

[Most_UniQue]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_qp_42.pdf

q7 (ii) , why have they taken time as 15 and s as 225? shudnt it be 0 and s=0 like the previous question? because it says total distance travelled after 15s and 225m is fr the first equation.

Once im clear with this , Im done with mechanics Tnx

 

[Nibz]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_42.pdf

q7 (ii) , why have they taken time as 15 and s as 225? shudnt it be 0 and s=0 like the previous question? because it says total distance travelled after 15s and 225m is fr the first equation.

Once im clear with this , Im done with mechanics Tnx

No, you can't take time as 0. That would make the distance 'infinity' and not 'zero'. To put it simple, you can't put zero in the denominator. That is the reason it's clearly mentioned in the question that at t= 15, s= 225
Put these values in the equation, and you will get the value of Constant.

 

[Most_UniQue]

No, you can't take time as 0. That would make the distance 'infinity' and not 'zero'. To put it simple, you can't put zero in the denominator. That is the reason it's clearly mentioned in the question that at t= 15, s= 225
Put these values in the equation, and you will get the value of Constant.

But in the previous question , y cudnt we take t as 0.5? instead we took t=0 . And also the distance we found is fr the first equation

 

[Lyfroker]

cant solve Q:1, 3 ,4 P42 oct/nov/09 Q:3 , 5 and 7 Oct/Nov/2010 P42 plzzzzzzzzzz help . . .. . . . .plzzzzzzzzzz ​

 

[Nibz]

But in the previous question , y cudnt we take t as 0.5? instead we took t=0 . And also the distance we found is fr the first equation

t= 0.5? I don't know which question are you talking about.
And no, these conditions are for all the three parts (i) (ii) and (iii).

 

[Nibz]

cant solve Q:1, 3 ,4 P42 oct/nov/09 Q:3 , 5 and 7 Oct/Nov/2010 P42 plzzzzzzzzzz help . . .. . . . .plzzzzzzzzzz ​

Mind posting the links?

 

[leosco1995]

You know, the chances of your questions getting answered will sky-rocket if you post images of the questions here.

 

[Most_UniQue]

t= 0.5? I don't know which question are you talking about.
And no, these conditions are for all the three parts (i) (ii) and (iii).

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_w08_qp_4.pdf
in 7 (ii) of this paper , they took t as 0 and v as 5 for finding the constant C .

 

[Most_UniQue]

t= 0.5? I don't know which question are you talking about.
And no, these conditions are for all the three parts (i) (ii) and (iii).

I mean in first part the time taken was 0.5 so dont we take t as 0.5 in 2nd question? like we did fr the other paper u jst answered

 

[Rabb94]

posts links of Mark scheme and question papers plz it wil be gr8[/quote

Its okay... I got the answer.... thanx anyway... some careless mistake..

 

[donor]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w10_qp_33.pdf
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w10_ms_33.pdf

please need help in Q.10 ii) b)

 

[Lyfroker]

Mind posting the links?

 

[mushoo]

can any one pls give me the formulas for finding workdone against resistnce of friction, with respect to kinetic, potential energy??
plss!! :'(