Mechanics M1: Post your doubt here

[iKhaled]

like 20 marks i may not get the B even if i get an A in m1 ?

dude i really can't say i did both in may june and the exam was really tough and i scored C in M1 and P1. best thing is to really have faith in god from ur heart and pray to get the score u want..

 

[leadingguy]

dude i really can't say i did both in may june and the exam was really tough and i scored C in M1 and P1. best thing is to really have faith in god from ur heart and pray to get the score u want..

how was the paper p1 this time??? ikhalid ???? how much u are expecting??? wud u lyk to share??

 

[iKhaled]

how was the paper p1 this time??? ikhalid ???? how much u are expecting??? wud u lyk to share??

vector question and question 10 were really somethin i never expected that it would come in exams. i never saw questions like these in past papers but the last question was really so easy and simple but due to exam stress and time i couldn't manage to solve it even though after i got back home i found it was easy 10 marks to get in this paper -_-..my luck :/ but i hope god be with us and improves my grade..pray for me guys, please what about u ?

 

[leadingguy]

vector question and question 10 were really somethin i never expected that it would come in exams. i never saw questions like these in past papers but the last question was really so easy and simple but due to exam stress and time i couldn't manage to solve it even though after i got back home i found it was easy 10 marks to get in this paper -_-..my luck :/ but i hope god be with us and improves my grade..pray for me guys, please what about u ?

will lost max. 9 or least 7 or 8 that is what i can guess. Alhamsulillah vectr part 2 and 3 part 1 were left unsolved didnot looked at it even for giving a try so 6 lost cnfrmd and 1 or 2 more

 

[iKhaled]

will lost max. 9 or least 7 or 8 that is what i can guess. Alhamsulillah vectr part 2 and 3 part 1 were left unsolved didnot looked at it even for giving a try so 6 lost cnfrmd and 1 or 2 more

what was 3 part 1 ?

 

[leadingguy]

dnt know a silly park proving

 

[iKhaled]

dnt know a silly park proving

hmm anyway did u watch felix?

 

[leadingguy]

hmm anyway did u watch felix?

felix????

 

[iKhaled]

felix????

maannn u just missed a historic event !! felix the guy who jumped 120,000 ft from earth its just insaaanneee they said he said newton is mistaken and there will be new laws about what happened today in the jump !!

 

[leadingguy]

maannn u just missed a historic event !! felix the guy who jumped 120,000 ft from earth its just insaaanneee they said he said newton is mistaken and there will be new laws about what happened today in the jump !!

oh will see abt it

 

[Just visiting]

I need help ugent plz.
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w10_qp_42.pdf
Question 3 i dont understand how it can be solve
The mark scheme made all step but i dont know y it changed sin(90-a) and cos(90-a) to sin(a) and cos(a)
Pleaze answer my doubt and give clear explanation

 

[iKhaled]

I need help ugent plz.
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w10_qp_42.pdf
Question 3 i dont understand how it can be solve
The mark scheme made all step but i dont know y it changed sin(90-a) and cos(90-a) to sin(a) and cos(a)
Pleaze answer my doubt and give clear explanation

bro this is a rule in trig that sin (90-theta) is cos theta and cos(90-theta) is sin theta
check in the calc sin ( 90-30) = cos 30 or not to prove the rule is correct!

 

[hussamh10]

dnt know a silly park proving

dont worry it was like only 2 marks

 

[Arjun Dhanak]

(i) R = mgcosθ
R = 10m cos 21
R = 9.336m

while the particle is going upward u have 2 forces acting opposite to its direction of motion...first the component of the weight and F
F = ma

lets find the acceleration of the particle
v = u + at
0 = 10-2a
a= -5

-mgsin-F = -5m
-10msin 21 - F = -5m
F = 1.416m

(ii) F = μR
μ = 1.416/9.336
μ = 0.152

(iii) while the particle is traveling downward only F is acting against the direction of motion
mgsinθ - F = ma
10msin21 - 1.416m = ma
a = 2.17 ms^-2

lets find the distance it moved ( note the distance moved from P to the highest point is the same distance it moved while it is goin back to P ) so,

s = 1/2(v + u)t
s = 1/2(10)(2)
s= 10m

v^2 = u^2 + 2as
v= √(0 + 2(2.17)(10))
v = 6.58 ms^-1

Hey thanks a lot for your time.. but i didn't get one thing.. why is it - mgsinθ - F = m* (-a)
i get that a is negative 5 or -5 so we write "-ma" but why the - sign in mgsinθ ???

 

[Arjun Dhanak]

bro this is a rule in trig that sin (90-theta) is cos theta and cos(90-theta) is sin theta
check in the calc sin ( 90-30) = cos 30 or not to prove the rule is correct!

ya and sin(90+θ)= cos(θ) and cos(90+θ) = -sin(θ)
by the way, you can find these in the syllabus aims or in the CIE Mathematics Learner Guide.. I'm sorry i'm not sure which one it is.
You can check out this learner's guide by CIE if you want.
http://www.cambridgestudents.org.uk...almaths/Learner Guide for AS and AL Maths.pdf

 

[Arjun Dhanak]

I hope we all get good grades in P1 and M1
Good Luck to everyone giving any exams!!

 

[iKhaled]

Hey thanks a lot for your time.. but i didn't get one thing.. why is it - mgsinθ - F = m* (-a)
i get that a is negative 5 or -5 so we write "-ma" but why the - sign in mgsinθ ???

i already said y it is -mgsintheta because this force is acting OPPOSITE to the direction of the motion. u got it ?

 

[hussamh10]

http://olevel.sourceforge.net/papers/9709/9709_s12_qp_41.pdf
Q7 plz help

 

[hussamh10]

http://olevel.sourceforge.net/papers/9709/9709_s12_qp_41.pdf
Q7 plzz paper after 3 days cant figure out his question
leadingguy
iKhaled

 

[leadingguy]

http://olevel.sourceforge.net/papers/9709/9709_s12_qp_41.pdf
Q7 plzz paper after 3 days cant figure out his question
leadingguy
iKhaled

aaaaaaahhhhhhh nice qstn still wrking.. it took more than half an hour yet. still unsolved.