Mechanics M1: Post your doubt here

[Asheeta]

Could you help me with 5(ii) plz?

Using s = ut + (1/2)a(t^2)
sP = 12t - 5(t^2)
sQ = 7t - 5(t^2)
3 sP = 8 sQ
3{12t - 5(t^2)} = 8 {7t - 5(t^2)}
36t - 15t^2 = 56t - 40t^2
5t( 5t - 4) = 0
so t = 4/5 = 0.8 s

V=u+at
vP = 12 +(-10*0.8) = 4 m/s
vQ = 7 + (-10*0.8) = -1 m/s (travelling in the opposite direction)

 

[elbeyon]

I guess everyone is done with their preparations, now approximately just 1 and a half day left for M1 ( P42 ) and those of us who are still working hard for our preparations, please don't panic. Remember that we still have more than 129,600 second left. 1 second is enough for many things to occur and we still have hundreds of thousands of seconds remaining. So utilize this time properly and best of luck with your preparations !

 

[Varuna0911]

Using s = ut + (1/2)a(t^2)
sP = 12t - 5(t^2)
sQ = 7t - 5(t^2)
3 sP = 8 sQ
3{12t - 5(t^2)} = 8 {7t - 5(t^2)}
36t - 15t^2 = 56t - 40t^2
5t( 5t - 4) = 0
so t = 4/5 = 0.8 s

V=u+at
vP = 12 +(-10*0.8) = 4 m/s
vQ = 7 + (-10*0.8) = -1 m/s (travelling in the opposite direction)

Thank you

 

[Asheeta]

I guess everyone is done with their preparations, now approximately just 1 and a half day left for M1 ( P42 ) and those of us who are still working hard for our preparations, please don't panic. Remember that we still have more than 129,600 second left. 1 second is enough for many things to occur and we still have hundreds of thousands of seconds remaining. So utilize this time properly and best of luck with your preparations !

Hii that's the attitude, I really appreciate.

 

[AhShun]

Could you help me with 5(ii) plz?

Jun11 p42 no5(ii)

 

[Varuna0911]

Jun11 p42 no5(ii)

jun11 p41 Q4

 

[TeKnOzOr]

I guess everyone is done with their preparations, now approximately just 1 and a half day left for M1 ( P42 ) and those of us who are still working hard for our preparations, please don't panic. Remember that we still have more than 129,600 second left. 1 second is enough for many things to occur and we still have hundreds of thousands of seconds remaining. So utilize this time properly and best of luck with your preparations !

yEah..tOtally agree brO..but dnt know if the paper will be as tough as the paper 1.:/
Inshallah everythings will be fine.
i've only 1 problem..zat is Timing..i usually gets out of time..can you just give me some advices brO
Jazakhallah!!

 

[iKhaled]

yEah..tOtally agree brO..but dnt know if the paper will be as tough as the paper 1.:/
Inshallah everythings will be fine.
i've only 1 problem..zat is Timing..i usually gets out of time..can you just give me some advices brO
Jazakhallah!!

did u time urself during practice at home ? or u just solve past papers without timing urself ?

 

[AhShun]

jun11 p41 Q4

Jun 11 p41 no4

 

[Varuna0911]

Jun 11 p41 no4

same paper no 2

 

[TeKnOzOr]

did u time urself during practice at home ? or u just solve past papers without timing urself ?

hmmm....yaa sometime i time myself!! not all the time!! but sometime i can manage...the problem is zat i mAkes many mistakes and wen i check in ms,the answers are different!! im jUs afraid brO

 

[iKhaled]

hmmm....yaa sometime i time myself!! not all the time!! but sometime i can manage...the problem is zat i mAkes many mistakes and wen i check in ms,the answers are different!! im jUs afraid brO

dude i see u r over stressed which is the most thing that leads to failure..see bro don't stress and be precise when u work. make the working looks neat and always use the correct significant figures and just take it easy. the reason u lose too many marks is because u r over stressed

 

[TeKnOzOr]

dude i see u r over stressed which is the most thing that leads to failure..see bro don't stress and be precise when u work. make the working looks neat and always use the correct significant figures and just take it easy. the reason u lose too many marks is because u r over stressed

hehe....Thanks brOzer!!
May Allah bless u always...bUt i can manage...koz i've completed the past exam papers but its just zat i've lost some practices for M1...
anyway...is the paper gonna be hArd brO..!?!

 

[iKhaled]

hehe....Thanks brOzer!!
May Allah bless u always...bUt i can manage...koz i've completed the past exam papers but its just zat i've lost some practices for M1...
anyway...is the paper gonna be hArd brO..!?!

man no one knows if its gonna be hard or not. only god knows..anyway practice hard and do whatever u can do and leave the rest up to god. god will always reward u fairly for how much u have worked so dont worry! god is with us all inshAllah

 

[bamteck]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_43.pdf

HELP NEEDED for no. 4

AhShun

 

[iKhaled]

bamteck

 

[Varuna0911]

Jun 11 p41 no4

and no 5(iii)

 

[AhShun]

same paper no 2

(i)Conservation of energy,
K.E initial + P.E initil + Work Done by Crane = K.E final + P.E final +Work done against resistance
0 + W.D by crane = 0 + mgh + 5750
W.D by crane = (1250)(10)(1.54) + 5750
W.D by crane = 25000 J

(ii) Work done = power x time
Time = Work Done / Power
= 25000 / (1.25x1000)
= 20 s

 

[AhShun]

and no 5(iii)

Jun11 p41 no 5(iii)

 

[AhShun]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_43.pdf

HELP NEEDED for no. 4

AhShun

Jun11 p43 no4
Don't be depressed(smily), here it is
This paper I've already done it