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y = e^(-x) sinx
First find the acceleration.Can someone please give me the final answer and working for this question.
If you sketch a velocity time graph. you will note that the slope of the curve will be constant since acceleration is constant. You will start from 0 (rest) and till 30m/s(final velocity)How to find the average velocity for this question?
If you sketch a velocity time graph. you will note that the slope of the curve will be constant since acceleration is constant. You will start from 0 (rest) and till 30m/s(final velocity)
Now, Average speed = total distance/total time.
Let time = t
Total distance will be the area under the graph
=[1/2*(t)*(30)]
Therefore,
Average speed = [1/2*(t)*(30)]/t
t and t cancels out and you will get 15 as your answer. Choice C
First step. Acceleration. As I stated in the previous question.Thanks alot. I have a doubt in one more question, if you are free.
U = sin4xPLZ help with this !
Thanks a lot !!U = sin4x
Find the new limits.
1) X = π/24
U = sin4(π/24) = sin(π/6) = ½
2) X =0
U = sin4(0) = sin(0) = 0
Differentiate the substitution.
U = sin4x
Du/dx = 4cos4x
Find dx
Du = 4cos4x (dx)
Dx = du/4cos4x
Now re-write the expression
= ʃcos^3(4x) dx
You have value of dx
= ʃcos^3(4x) * (du/4cos4x)
Cancelling out will give you:
= ʃcos^2(4x)/4 du
= ¼ ʃ(1 – sin^2(4x) ) du
= ¼ ʃ(1 – u^2)
= ¼ [ u – (u^(3)/3) ]
= ¼ [(3u – u^3)/3)]
Put the limits
= ¼ {(3(0.5) – (0.5^(3))/3) – (3(0) – (0^3)/3)}
= ¼ {[(1.5 – 0.125)/3] – (0)}
= ¼ (1.375/3)
= ¼ (11/24)
= 11/96 Ans
in part ii i am stuck at this step ..
Use the substitution now
ʃ5sin^3x*cos^2x dx
You have dx and u substitution
= ʃ 5sin^3x(u^2) (du/-sinx)
Cancelling out will give you,
=ʃ-5sin^2x(u^2)
Use trig identity : sin^2x = 1 – cos^2x
=-ʃ5(1 – cos^2x)(u^2)du
=-5ʃ(1 – u^2)(u^2)du
= -5ʃu^2 – u^4 du
=- 5 [(u^3/3) – (u^5/5)]
Put limits in.
-5 {[(1/3 – 1/5) – (0/3 – 0/5)]}
= -5 (2/15)
= -10/15
= -2/3
Area = 2/3 Ans.
*I think I messed up a sign somewhere or its the way it is
So aren't you having this book in pdf form or is it available for free online ?I'm using this book :
http://www.amazon.com/Concise-Course-Advanced-Level-Statistics/dp/074875475X/ref=oosr
covers both S1 and S2
As for pastpapers, when I bought solved past papers, I had chosen S1 and M1 but later I changed my mind and found Statistics much more bearable than Mechanics, so I've solved papers for S1 but not for S2..But it doesn't matter, I'll print out unsolved ones and I can check them through mark schemes! What's your plan?
and one thing more ...does that book contains the topics such as cdf ,pdf , chi square etc ???I'm using this book :
http://www.amazon.com/Concise-Course-Advanced-Level-Statistics/dp/074875475X/ref=oosr
covers both S1 and S2
As for pastpapers, when I bought solved past papers, I had chosen S1 and M1 but later I changed my mind and found Statistics much more bearable than Mechanics, so I've solved papers for S1 but not for S2..But it doesn't matter, I'll print out unsolved ones and I can check them through mark schemes! What's your plan?
Can someone please help me with this question (projectile motion)?
Yes, the book is available online, check this website:So aren't you having this book in pdf form or is it available for free online ?
Are there any solved papers for S2 ??? ...if you have them then i need them urgently.
I have tried to use to use ms for S2 but it didnt work out for me bcz the method is not given in the ms :/
Yes, it does cover these, the probability density function and cumulative distribution function are covered in 6th unit, chi square must be there too and I can assure you, it covers ALL of the syllabus, and even more than that, soyou must keep checking the syllabus, like there is the one "Regression and Corrlation", that I haven't really found in syllabus so I skipped that.and one this more ...does that book contains the topics such as cdf ,pdf , chi square etc ???
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