IOQs Discussion

This discussion is mainly for the NSEs, including NSEP, NSEC, NSEJS, NSEB, NSEA held in India. However, anyone who wants to practice good Science questions, you are welcome! Edit : IOQ instead of NSE. The rules are:

Post problems related to Science
Don't post repeated problems(I mean if someone has posted it already, don't post again).
Past year problems are also welcome.
Don't post comments not related to any problem.
Don't write the answers in the comments.
If you are not posting a problem yourself, and find a good problem in the Community(old or new), please post it here.
If you learnt any new concept, do share it with us!
I request everyone to please share the links of the previous deleted discussion.
Let's together learn Science!

Easy Math Editor

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.
Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

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Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
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`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

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(Posting my comment again)

@Vinayak Srivastava here is a special folder link for you, and anybody who wants it. I have added some books which are interesting and explain the concepts very well along with some problem-solving tricks. It contains Physics, Maths and Chemistry books. I have a lot more books, let me know if you want. Others can find it useful too, I have added some of my university books also

Siddharth Chakravarty - 5 months, 1 week ago

What? 1.9 GB in zip? How do I convert it? lol

Vinayak Srivastava - 5 months, 1 week ago

Download the zip, and then you will see the folders in the zip. You can use apps like WinRAR to extract it.

Siddharth Chakravarty - 5 months, 1 week ago

@Siddharth Chakravarty, while opening the link, my name appears in the folder name, even though the folder is yours. Have you only named it like that, or it happens with everyone? I am using Drive for first time, so I am asking, as I want to know more about Drive. Also, can you tell which software I can use to extract as a zip and download? And If you have named it mine, please remove it, I am not the author of the books, and I haven't worked as hard as you to collect the books, as I don't like seeing my name in something I haven't done, you should write your name instead, as you have done the $F \cdot S$ . $\begin{aligned} &~~~\LARGE{\cdot \cdot} \\ &\Huge{\smile} \\ \end{aligned}$

Vinayak Srivastava - 4 months, 3 weeks ago

Lol.The name appears on my side also .extract with zip

SRIJAN Singh - 4 months, 3 weeks ago

No, I named the drive after your name because I have many folders like that, so I put the name of the person for whom I had curated the folder for, just to remember while searching up. I had to also put up your middle name because there are already 2 Vinayak Srivastava's in my previous folders. You can download just by pressing the download button there in Google drive itself, and to extract files you can search Winrar on the web, download it and use it to extract the zip file.

Siddharth Chakravarty - 4 months, 3 weeks ago

@Siddharth Chakravarty – I don't like seeing my name in things I haven't done, please name it "Brilliant books" or something like that, I request you. Also, how do you know my middle name?

Vinayak Srivastava - 4 months, 3 weeks ago

@Vinayak Srivastava – Ok I will change the name, once I get access to my laptop.

Siddharth Chakravarty - 4 months, 3 weeks ago

@Siddharth Chakravarty – I got to know your last name, because when you had joined the Hangout group it had shown your middle name .

Siddharth Chakravarty - 4 months, 3 weeks ago

@Siddharth Chakravarty – The extracting works, thanks for that! It downloads directly also, I see now, but it takes more data.

Vinayak Srivastava - 4 months, 3 weeks ago

@Vinayak Srivastava – @Vinayak Srivastava,@Siddharth Chakravarty..As i open the folder and if I click on book section it isn't opening ..if vinayak has the same problem ...so make a solution for this.

SRIJAN Singh - 4 months, 3 weeks ago

@Srijan Singh – But @Vinayak Srivastava said he downloaded the books, and plus I also don't face any problems. Maybe you are having some problem, explain what is going wrong while opening so I can understand and suggest what to do.

Siddharth Chakravarty - 4 months, 3 weeks ago

@Siddharth Chakravarty – No worries it's opening now .There was some of the servers down from google

SRIJAN Singh - 4 months, 3 weeks ago

These lecture may be helpful in physics :

Classical mechanics

Electricity and magnetism

Sahar Bano - 5 months, 1 week ago

@Siddharth Chakravarty. how much megabytes does (special folder link) is?

SRIJAN Singh - 5 months, 1 week ago

@Siddharth Chakravarty.hey what have you inserted in (special folder link) ? and give some more books of maths and science

SRIJAN Singh - 5 months, 1 week ago

do this @Vinayak Srivastava,@Kumudesh Ghosh,@Siddharth Chakravarty

SRIJAN Singh - 5 months, 1 week ago

@Vinayak Srivastava @SRIJAN Singh Check the link now, I have uploaded separate files in the folder 'Books'.

Siddharth Chakravarty - 5 months, 1 week ago

Thank you! I will download a few today, I see there is a very big collection of books!

Vinayak Srivastava - 5 months, 1 week ago

nice @Siddharth Chakravarty.Thanks for your support towards young one's

SRIJAN Singh - 5 months, 1 week ago

@Vinayak Srivastava.hey have you understood the high level science or mathematics

SRIJAN Singh - 5 months, 1 week ago

?? Means?

Vinayak Srivastava - 5 months, 1 week ago

means have you read something in science and mathematics (special folder link) and understood

SRIJAN Singh - 5 months, 1 week ago

@Srijan Singh – No, I haven't read anything, I'll see to in in a few days when my school exams are done.

Vinayak Srivastava - 5 months, 1 week ago

@Vinayak Srivastava – It is effective bro I am reading that only (now)

SRIJAN Singh - 5 months, 1 week ago

@Srijan Singh – hey Tell me something about Neeraj(Oi doug)

SRIJAN Singh - 5 months, 1 week ago

Try this problem Graphical Mechanics

Aryan Sanghi - 5 months, 1 week ago

@Vinayak Srivastava,@Siddharth Chakravarty,@Aryan Sanghi,@Pi Han Goh.try this

SRIJAN Singh - 5 months, 1 week ago

I have a 30GB folder on stuff like this for science, math and more. How do I send it to you though @Vinayak Srivastava???

Percy Jackson - 5 months, 1 week ago

can you share to me

SRIJAN Singh - 5 months, 1 week ago

How? Where should I upload?

Percy Jackson - 5 months, 1 week ago

@Percy Jackson – Bro you have drive ?

SRIJAN Singh - 5 months, 1 week ago

@Srijan Singh – No I don't have a car LOL yes I have drive, but I can't send to some person I don't know from Google Drive :)

Percy Jackson - 5 months, 1 week ago

@Percy Jackson – have you store all the books in drive?

SRIJAN Singh - 5 months, 1 week ago

Are you looking for this? Maybe this? This might help you. How about this?

Click this mention, because it is a secret link that will help you -> @Vinayak Srivastava

Percy Jackson - 5 months, 1 week ago

@Vinayak Srivastava - NSE stuff links :)

Percy Jackson - 5 months, 1 week ago

@Percy Jackson.do you have some books that are effective for nse's

SRIJAN Singh - 5 months, 1 week ago

@Srijan Singh – I'm not much of a book guy. And NSE's are Indian competitions bro.

PS - Today is August 18th, a very special day. Google if you want. @SRIJAN Singh

Percy Jackson - 5 months, 1 week ago

no,@Vinayak Srivastava wants book

SRIJAN Singh - 5 months, 1 week ago

He never specified that, but lmgtfy :)

Actually, @Vinayak Srivastava can find atleast a million things like this on Google, so he can Google it himself, so lmgtfy doesn't work here :)

Percy Jackson - 5 months, 1 week ago

No, I need questions. Others may need books, some may need these websites.

Vinayak Srivastava - 5 months, 1 week ago

@Vinayak Srivastava – Uhh.....don't the papers have questions @Vinayak Srivastava ?

thinking to myself : do they?

Percy Jackson - 5 months, 1 week ago

@Percy Jackson – Yes, but they are Previous Year Questions, I want original ones. I will solve PYQs in the end.

Vinayak Srivastava - 5 months, 1 week ago

@Vinayak Srivastava – bro ,if you will not have books then how will you do questions

SRIJAN Singh - 5 months, 1 week ago

@Srijan Singh – I admire that book take a long time to read

SRIJAN Singh - 5 months, 1 week ago

@Srijan Singh – I have books already, I don't want more. @Siddharth Chakravarty has also given a lot of books, it will take me many years to read them lol

Vinayak Srivastava - 5 months, 1 week ago

@Vinayak Srivastava – Ok (some text)

Percy Jackson - 5 months, 1 week ago

Try this problem Graphical Mechanics!! (Part 2)

Aryan Sanghi - 5 months ago

Try this problem Graphical Mechanics (part 3)

Aryan Sanghi - 5 months ago

Try this problem instead Graphical Mechanics (part 4)

Aryan Sanghi - 4 months, 3 weeks ago

Try this Vectors Basics problem

Vinayak Srivastava - 4 months, 3 weeks ago

New problem: A constrained pulley!

Vinayak Srivastava - 4 months, 3 weeks ago

Try this problem Moving Wedge

Aryan Sanghi - 4 months, 3 weeks ago

Please see this problem and please post a solution : May the Potential Energy be with you!

Vinayak Srivastava - 4 months, 2 weeks ago

This might help

Zakir Husain - 4 months, 2 weeks ago

Great thank to @Zakir Husain for giving his support towards the young wonders including me

SRIJAN Singh - 4 months, 2 weeks ago

@Vinayak Srivastava,you might like this

Kriti Kamal - 4 months, 2 weeks ago

Nice, but easy. Pure logic is enough to solve it. Though I must point out @Kriti Kamal, that leaves are not exactly green, rather they appear green due to the green pigment chlorophyll present in the chloroplasts. This is because leaves can be other colors as well. These kind of leaves just have chlorophyll in minority compared to the other colored pigments. Though this doesn't change the answer.

Percy Jackson - 4 months, 2 weeks ago

if it does not changes the answer,then i will not argue with you。

Kriti Kamal - 4 months, 2 weeks ago

@Kriti Kamal – It doesn't change the answer, but it deems your solution to be partially wrong. This is not an argument. Stating facts that are only partially right is a flaw in the solution, so your solution is imperfect, but you can change it, if you wish to, which in my opinion you should, but then again, that's my opinion. @Kriti Kamal

Percy Jackson - 4 months, 2 weeks ago

@Percy Jackson – Thanks for your advice.

Kriti Kamal - 4 months, 2 weeks ago

@Kriti Kamal – No problem :)

Percy Jackson - 4 months, 2 weeks ago

commisconception

Kriti Kamal - 4 months, 1 week ago

Important Announcements

Zakir Husain - 4 months, 1 week ago

Thanks you sir for awaring this to all.

SRIJAN Singh - 4 months, 1 week ago

You mean - "Thanks sir, for bringing this to our notice" or "Thank you sir, for sharing this with us". Bad grammar is the reason most fail their English exams @SRIJAN Singh, but not me, I have a Business English degree :)

Percy Jackson - 4 months, 1 week ago

@Percy Jackson – Thanks for teached of English grammer, I hope that these will turned out to be very usedful to ours, because I has pretty weak on the English subject. LOL, I realised now how long does it take to write something incorrect.

Siddharth Chakravarty - 4 months, 1 week ago

@Siddharth Chakravarty – LOL its super-hard to get something incorrect if you know how it is correct. Used to typing the correct words I guess lol

Percy Jackson - 4 months, 1 week ago

@Percy Jackson – I was in hurry,little bit weak in english btw the notice is non of @Percy Jackson business because it is for Indian exams

SRIJAN Singh - 4 months, 1 week ago

@Srijan Singh – Ya I know bud, but as a person with a Business English degree I'm supposed to correct others English to annoy them :)

Percy Jackson - 4 months, 1 week ago

@Percy Jackson – Yup! Percy Jackson

SRIJAN Singh - 4 months, 1 week ago

Important Announcements

Zakir Husain - 4 months, 1 week ago

you may try this

Lakshya Khilwani - 3 months, 3 weeks ago

New problem

Kriti Kamal - 3 months ago

Try this problem by me Bouncy Bouncing Balls!!

Aryan Sanghi - 3 months ago

Try this problem by me Edge Case Of Rolling!!

Aryan Sanghi - 2 months, 2 weeks ago

All the best to everyone giving IOQM and/or IOQJS tomorrow!

Vinayak Srivastava - 6 days, 14 hours ago

Ya thanks!!!!!!

SRIJAN Singh - 6 days, 14 hours ago

I also have 1 doubt in Vertical Circular Motion. Any help will be highly appreciated.

If in a vertical circle, the velocity at lowest point is $\sqrt{2gR}$ [ $R$ is radius of circle] then after reaching the horizontal point, what will happen to the particle? Will it continue in the semi-circular arc, will it fall freely in straight line, or fall like a projectile?

Vinayak Srivastava - 6 days, 14 hours ago

Look the velocity at any height h from the lowest point is $\sqrt{u^{2}-2gh}$ where u is the velocity at the lowest point. So at the horizontal point, it is at a height h=R from the lowest point and the initial velocity is $\sqrt{2gR}$ as per you, so the velocity at the horizontal point should come out to be 0, which means the particle is at rest there but still gravity would act on it, and it will again fall down, and then go on the opposite side, come back down, and so on, and thus the system becomes a pendulum.

Siddharth Chakravarty - 6 days, 12 hours ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$