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Old Mar 24th 2018, 06:21 AM   #1
wh0
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Kinematics

No need to help

Last edited by wh0; Mar 24th 2018 at 09:51 AM.
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Old Mar 24th 2018, 07:09 AM   #2
Pmb
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Originally Posted by wh0 View Post
These questions are my homework. But, I couldn't solve any of them.
Can anyone help?
Before we try please read the "Must read" thread at
Must read before posting a problem : please show your attempt!

The URL is self explanatory. We need you to make some effort even if you think its nothing. Helping means guiding you to how to approach solving it.

Caution: Its easy to have someone do it for you and I'm certain many members here are happy to merely post the derivation and solution. But I am assuming that you want to pass the course and that means understanding how to do it. Struggling is part of the process of learning. Our minds seem to try to take different routes to the solution, first this way then that etc until the entire path becomes clear. That's how we "hunt" the solution down. If someone shows you the path then its misleading you into thinking you know how to do physics. In a sense that's true but when it comes to working out new problems you're much less prepared.

For example; when I got by first PC in 1995 it was a struggle figuring out how to use it. It was the struggle that made me learn though. Later I got my brother a computer. He kept calling me asking me how to do this and that. It never ended. I finally told him I won't help him because doing so is bad for him and its the struggle that makes you learn. He got pissed off at me. Years later he thanked me and said that he completely understood what I did and why.

So when I say I won't help you until you take a shot its not because I'm lazy. It's because I'm a good tutor.
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Old Mar 24th 2018, 07:16 AM   #3
wh0
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Who told you that I did'nt make any efford to solve these questions? I lost my two hours for thinking how to solve these questions. I'm taking 6 courses now. Homeworks,quizzes and reports never finish. My proffessor thinks just like you. I'm asking I lost my two hours, what I learnt? Nothing. I don't have more time to lose. There are another five courses to study.

Last edited by wh0; Mar 24th 2018 at 07:24 AM.
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Old Mar 24th 2018, 07:36 AM   #4
Pmb
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Originally Posted by wh0 View Post
Who told you that I did'nt make any efford to solve these questions?
People come here every single day asking us for help, many expecting us to do all the work. Since you made no attempt in your opening post to tell us what you tried, what did you expect us to do, e.g. task you to show us your work? You were supposed to read the link I showed you before you posted but either you didn't or you ignored it. That's a waste of time, both yours and ours. Now you responded with this snipe and still didn't mention what you tried. More wasted time.

There are no mind readers in the world so when people create a thread saying - "Look at this - Please help me" and not state what they tried then in most cases they made no try. 90% of those start threads will state how far they got or what they tried. We don't assume you're the 10% but the even fewer who expect us to do all the work. In any case I was explaining why we require people to take a shot. Just because I said "you" is merely a rhetorical choice and not an accusation. I suggest you don't assume such things. You could have just replied "I did and here's my work." But you didn't do that. I asked you to read the page I gave you a link to. I's clear that you didn't and instead assumed that you know what I was referring to. You're wrong.

In science its crucial to pay close attention and follow instructions precisely. In this case you didn't. My old science profs to test us on that. On a test he gave us the first instructions was to read the entire test, everything, before starting. A lot of people ignored that direction because they wanted to use that time to solve problems. But in that case they were very mistaken. The last instruction on the test stated not to do the test but simply turn it over and put the pencil down. Those of us who did that snicker ed while the others worked hard.

In this case the page says to show your attempt. Even the URL says that and I made it clear. I merely added here why forcing a person (in general, not necessarily you) to try is important.

Understand?

Last edited by Pmb; Mar 24th 2018 at 08:25 AM.
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Old Mar 24th 2018, 11:33 AM   #5
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For your information I looked at you opening post this morning, but since all I could see was a box with a red cross in it and no statement of the question I decided not to bother as I certainly have better things to do.

If you are that disinterested in your own work, why do you think anyone else would be more interested?

Note I have helped lots of people here and on other sites.

The cooperative ones get on a great deal faster and go a great deal further in my opinion.
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Old Mar 24th 2018, 01:23 PM   #6
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He's being quite unfair. I wanted to help but he didn't get me to do his homework for him and instead I explained that he had to read the rule first. Instead of coming back after reading what I wrote and posted only this in his response
Who told you that I did'nt make any efford to solve these questions?
I corrected him again. He then went back and changed the OP and added to his second post as if we are unfamiliar with hammering away at a problem for a long time in frustration.

He appears to be the angry young man since he didn't even take time out to correct his spelling. That he didn't describe what he did made me very suspicious. Had acted more mature and described what he did I'd have helped him. He could have gotten help very quickly if he wasn't the angry young man.

Last edited by Pmb; Mar 24th 2018 at 01:26 PM.
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Old Mar 24th 2018, 01:37 PM   #7
wh0
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Originally Posted by studiot View Post
For your information I looked at you opening post this morning, but since all I could see was a box with a red cross in it and no statement of the question I decided not to bother as I certainly have better things to do.

If you are that disinterested in your own work, why do you think anyone else would be more interested?

Note I have helped lots of people here and on other sites.

The cooperative ones get on a great deal faster and go a great deal further in my opinion.
Thank you for your interest.
Of course, I'm interested in my work. I must do it. Otherwise, I can't learn,I can't pass my exams. I lost more than two hours to solve these questions. After that I uploaded problems here. Pmb told me that there is not my efford. Then I wrote there I don't need help. I'll try to solve them again. If I can't, probably I'll take the course next year again.

You all still think that I'm lazy student. Wait I'll show you all my dynamics notebook.
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Old Mar 24th 2018, 02:02 PM   #8
wh0
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https://drive.google.com/open?id=1WP...XtNGpoFsxl2PGp

This is my dynamics notebook which is only for problems. We have covered only two chapters. I solved all these problem only for two chapters.

People call me liar. They don't assume me 10%.
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Old Mar 24th 2018, 02:08 PM   #9
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Originally Posted by wh0 View Post
Pmb told me that there is not my efford.
Not that I know exactly what "is not my efford" means but I didn't say anything of the sort. I told you to read that page. If you did then you'd know that the forum helpers follow the guidelines set for us. That page reads
The Helpers and the staff of the forum have agreed that they won't give a full answer to a problem posted with no attempt (except maybe in some cases).

The Helpers are here to help you to understand your weaknesses by going through the asked questions with you and not here to solve your physics problems.

It is imperative to show an attempt to a problem. If you don't know how to start, say it. Helpers will give you a push in the right direction.
Originally Posted by wh0 View Post
Then I wrote there I don't need help.
Nope. Then you edited your response to me to read
Who told you that I did'nt make any efford to solve these questions? I lost my two hours for thinking how to solve these questions. I'm taking 6 courses now. Homeworks,quizzes and reports never finish. My proffessor thinks just like you. I'm asking I lost my two hours, what I learnt? Nothing. I don't have more time to lose. There are another five courses to study.
Then well over two hours later you changed he OP to read No need to help

And you did not loose two hours. You spent two hours doing homework and that is never time lost.

What do you mean your professor thinks like us? I'm tempted to take that as a compliment but I doubt that's what you meant.

Originally Posted by wh0 View Post
I'll try to solve them again. If I can't, probably I'll take the course next year again.
I wanted to make sure I did the best I could in college so I never took more than 4 courses in a semester. It took two additional years but it was worth it and I had two majors when I finished.

Originally Posted by wh0 View Post
You all still think that I'm lazy student.
If you want to put words into our mouths like that then please try to make hen then taste like fresh raspberries.

Originally Posted by wh0 View Post
Wait I'll show you all my dynamics notebook.
Don't go assuming you know what people think. So far your a very bad mind reader.

If instead of showing us your notebook you could have easily spent that kind of time by describing how you approached the problem at hand. If someday you finally decide to read the page I pointed you to then you'll find out that it says
you don't know how to start, say it. Helpers will give you a push in the right direction.
Know what that means? It quite literally means that you could have responded by saying "I have no fragging idea how to even begin solving it" at which point I would have started to help. Instead you refused to look and got pissed off and perhaps left. Your bad, not mine. (Not to be confused with "You're bad").

Don't you get it? We WANT to help you and as soon as possible but you're making it impossible to do that because of this attitude that you copped.
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Old Mar 24th 2018, 03:56 PM   #10
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Originally Posted by wh0 View Post
Thank you for your interest.
Of course, I'm interested in my work. I must do it. Otherwise, I can't learn,I can't pass my exams. I lost more than two hours to solve these questions. After that I uploaded problems here. Pmb told me that there is not my efford. Then I wrote there I don't need help. I'll try to solve them again. If I can't, probably I'll take the course next year again.

You all still think that I'm lazy student. Wait I'll show you all my dynamics notebook.
I don't think you are a lazy student, or that you are hardworking either.

I have literally no information to go on except your own statement that there were two questions you could not manage amongst others you presumably could.

I have already told you I do not know, and have no way of knowing, what those questions are, until you tell me.

I can offer some advice from experience, though.

Many who post here and elsewhere make a complete hash of stating their question with a result that many posts and days are lost simply clearing up exactly what question is being asked.

So always post the entire question exactly as stated and then say something like

"I could find the velocity, but couldn't work out how to find the acceleration."

Or

"I got 27, but the book says 33 and I don't know what I did wrong"

Or just

"I don't know where to start this one"

Each one of these short statements is extremely helpful to potential responders and can shorten the answer time significantly.

So start again and just ask your question.

If there are two questions start two threads, don't mix them up.

You can have as many threads as you need for this.
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