Friday, March 29, 2024
06:55 AM (GMT +5)

Go Back   CSS Forums > CSS Optional subjects > Group II > Physics

Reply Share Thread: Submit Thread to Facebook Facebook     Submit Thread to Twitter Twitter     Submit Thread to Google+ Google+    
 
LinkBack Thread Tools Search this Thread
  #1  
Old Thursday, May 21, 2015
IslamabadKid's Avatar
Senior Member
 
Join Date: Oct 2012
Location: Islamabad
Posts: 112
Thanks: 0
Thanked 73 Times in 47 Posts
IslamabadKid is on a distinguished road
Post I. Mechanics(related Past papers' questions and discussion)

By the end of this month - May, I am planning to complete the very first portion of Physics, Mechanics, out of eight different portions. Underneath this post, and in this thread, the solutions of questions of the past fifteen years related to Mechanics will be posed. The basic aim of this thread will be to have a discussion regarding the different facets of the subject-matter and to save the past papers' solutions.

All those who are going to opt Physics as an optional subject will be welcomed for sharing the stuff related to the portion, Mechanics, shared below with the bullet "I."

NOTE: Please do not comment below if you have any unrelated thing to share. (Sorry for an orange colour, as red is reserved for moderators maybe; but I hope you will not skip this important note)

Reply With Quote
The Following User Says Thank You to IslamabadKid For This Useful Post:
lovereflector (Friday, May 22, 2015)
  #2  
Old Friday, May 22, 2015
AZKAFATIMA's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Sep 2013
Location: Where Am I?
Posts: 258
Thanks: 15
Thanked 240 Times in 117 Posts
AZKAFATIMA is on a distinguished road
Post

Which is the correct numerical in paper 2000

Find the unit vector perpendicular to i+j and j+?
Or
Find the unit vector perpendicular to i+j and j+k

As per my knowledge second option is right and its typing error in first one. Reply must so i could try it
Reply With Quote
  #3  
Old Friday, May 22, 2015
IslamabadKid's Avatar
Senior Member
 
Join Date: Oct 2012
Location: Islamabad
Posts: 112
Thanks: 0
Thanked 73 Times in 47 Posts
IslamabadKid is on a distinguished road
Post Physics-Vectors

Yes, it is "j+k."

Here is the solution:


Redo this again, as I have just done it hurriedly. I hope it is correct; however, if you find any error, do mention it.

NOTE: I shall share another method as well, which involves matrices. That method seems more elegant to me than the aforementioned one.
Reply With Quote
The Following User Says Thank You to IslamabadKid For This Useful Post:
Noore776 (Sunday, June 07, 2015)
  #4  
Old Friday, May 22, 2015
IslamabadKid's Avatar
Senior Member
 
Join Date: Oct 2012
Location: Islamabad
Posts: 112
Thanks: 0
Thanked 73 Times in 47 Posts
IslamabadKid is on a distinguished road
Post Physics-Vectors(Same question as above)

Another method(Matrix method) just for confirmation.

Reply With Quote
The Following 2 Users Say Thank You to IslamabadKid For This Useful Post:
lovereflector (Saturday, May 23, 2015), Noore776 (Sunday, June 07, 2015)
  #5  
Old Friday, May 22, 2015
AZKAFATIMA's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Sep 2013
Location: Where Am I?
Posts: 258
Thanks: 15
Thanked 240 Times in 117 Posts
AZKAFATIMA is on a distinguished road
Default

Error in uploading second image. Same method as solution 1 same answer. Finally i solved the vector problem without any help.


Reply With Quote
The Following User Says Thank You to AZKAFATIMA For This Useful Post:
Noore776 (Sunday, June 07, 2015)
  #6  
Old Friday, May 22, 2015
AZKAFATIMA's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Sep 2013
Location: Where Am I?
Posts: 258
Thanks: 15
Thanked 240 Times in 117 Posts
AZKAFATIMA is on a distinguished road
Post

Calculate the angular momentum, about the Earth’s center of a 50 kg person on the equator of the rotating earth.

Check this. I am not sure



Reply With Quote
The Following User Says Thank You to AZKAFATIMA For This Useful Post:
Noore776 (Sunday, June 07, 2015)
  #7  
Old Saturday, May 23, 2015
IslamabadKid's Avatar
Senior Member
 
Join Date: Oct 2012
Location: Islamabad
Posts: 112
Thanks: 0
Thanked 73 Times in 47 Posts
IslamabadKid is on a distinguished road
Post Angular momentum

Hey first of all, please use the vector notation where it is required. Otherwise, you will lose marks. Moreover, do not skip the pictorial representation of any question(where required).Those are the few things I noticed while checking your solution. Apart from that, you have correctly solved the whole problem. Also, do scrutinise my solution as well, for it will help us improve and revamp our concepts and solving methodology.

Here is my solution:
Reply With Quote
The Following User Says Thank You to IslamabadKid For This Useful Post:
Noore776 (Sunday, June 07, 2015)
  #8  
Old Saturday, May 23, 2015
AZKAFATIMA's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Sep 2013
Location: Where Am I?
Posts: 258
Thanks: 15
Thanked 240 Times in 117 Posts
AZKAFATIMA is on a distinguished road
Default

Answers resemble but method is different. Your's is more authentic
Reply With Quote
  #9  
Old Saturday, May 23, 2015
AZKAFATIMA's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Sep 2013
Location: Where Am I?
Posts: 258
Thanks: 15
Thanked 240 Times in 117 Posts
AZKAFATIMA is on a distinguished road
Post

Check this also. If any other method, share.



Reply With Quote
  #10  
Old Saturday, May 23, 2015
IslamabadKid's Avatar
Senior Member
 
Join Date: Oct 2012
Location: Islamabad
Posts: 112
Thanks: 0
Thanked 73 Times in 47 Posts
IslamabadKid is on a distinguished road
Post Angular Momentum and Torque

That is how I solved:

Reply With Quote
The Following User Says Thank You to IslamabadKid For This Useful Post:
Noore776 (Sunday, June 07, 2015)
Reply

Tags
mechanics, past papers, physics, solutions

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



CSS Forum on Facebook Follow CSS Forum on Twitter

Disclaimer: All messages made available as part of this discussion group (including any bulletin boards and chat rooms) and any opinions, advice, statements or other information contained in any messages posted or transmitted by any third party are the responsibility of the author of that message and not of CSSForum.com.pk (unless CSSForum.com.pk is specifically identified as the author of the message). The fact that a particular message is posted on or transmitted using this web site does not mean that CSSForum has endorsed that message in any way or verified the accuracy, completeness or usefulness of any message. We encourage visitors to the forum to report any objectionable message in site feedback. This forum is not monitored 24/7.

Sponsors: ArgusVision   vBulletin, Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.