anyone know how to solve this? - Singapore Forums by SGClub.com
Singapore Forums by SGClub.com
Sitemap Contact Us FAQ Singapore Forums by SGClub.com
Home Photos Member List Register Mark Forums Read  
Go Back Home > Lifestyle > School Life > Math Help » anyone know how to solve this?

Why aren't you a member of SGClub.com yet??

» Join 130,000+ other members in chatting.
» Make lots of new friends here.
» Keep up-to-date with current events.
» Participate in Club outings.
» Download lots of Free Stuff!

Registration just takes 2mins and is absolutely free so join our community today!

I Want to Choose my Own Personal Nickname Now!


Reply
 
LinkBack Thread Tools Display Modes
Old 18th May 2013, 08:56 PM   #1 (permalink)
one more year to go...
oldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to all

 
oldvirgin's Avatar
 
Posts: 9,903
Join Date: Aug 2011
Likes: 91
Liked 348 Times in 298 Posts
Gender:

anyone know how to solve this?



I m totally clueless

Sponsors:
__________________
http://gameofthrones.me.uk/images/d52a6ed54940a9f9f8166c7ca89fac8a.gif
oldvirgin is offline  
Add to oldvirgin's Reputation Reply With Quote
Old 19th May 2013, 06:22 PM   #2 (permalink)
Experienced SGClubber
InfinityFrost is a jewel in the roughInfinityFrost is a jewel in the rough

 
Posts: 1,025
Join Date: Nov 2011
Likes: 33
Liked 80 Times in 68 Posts
Gender:

Re: anyone know how to solve this?

I'm interested in knowing how to solve this too! Seems like university/engineering mathematics.

InfinityFrost is offline   Add to InfinityFrost's Reputation Reply With Quote
Old 19th May 2013, 06:37 PM   #3 (permalink)
Addicted SGClubber
Betakuwe has a spectacular aura about

 
Betakuwe's Avatar
 
Posts: 874
Join Date: Sep 2010
Likes: 6
Liked 48 Times in 41 Posts
Gender:

Re: anyone know how to solve this?

Idk anything about Phong illumination but I'm assuming the incident angle is equal to the reflection angle and the light ray that is reflected from the sphere and directly into the viewer at origin is the brightest, am I right?

__________________
Are you ready to get serious?
Betakuwe is offline   Add to Betakuwe's Reputation Reply With Quote
Old 19th May 2013, 10:29 PM   #4 (permalink)
one more year to go...
oldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to all

 
oldvirgin's Avatar
 
Posts: 9,903
Join Date: Aug 2011
Likes: 91
Liked 348 Times in 298 Posts
Gender:

Re: anyone know how to solve this?

Originally Posted by Betakuwe View Post
Idk anything about Phong illumination but I'm assuming the incident angle is equal to the reflection angle and the light ray that is reflected from the sphere and directly into the viewer at origin is the brightest, am I right?
hmm I guess u are right, so I have to find the point of intersection between the ray and the sphere?

__________________
http://gameofthrones.me.uk/images/d52a6ed54940a9f9f8166c7ca89fac8a.gif
oldvirgin is offline   Add to oldvirgin's Reputation Reply With Quote
Old 20th May 2013, 09:20 AM   #5 (permalink)
Experienced SGClubber
whitecorp is a glorious beacon of lightwhitecorp is a glorious beacon of lightwhitecorp is a glorious beacon of light

 
whitecorp's Avatar
 
Posts: 2,404
Join Date: Jul 2009
Likes: 0
Liked 211 Times in 174 Posts
Gender:

Re: anyone know how to solve this?

The full solutions to the problem. Hope it helps. Peace.




whitecorp is offline   Add to whitecorp's Reputation Reply With Quote
Old 20th May 2013, 10:52 AM   #6 (permalink)
one more year to go...
oldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to all

 
oldvirgin's Avatar
 
Posts: 9,903
Join Date: Aug 2011
Likes: 91
Liked 348 Times in 298 Posts
Gender:

Re: anyone know how to solve this?

Thanks! but is there a simpler way to get the answer without using LaGrange Multipliers as we haven being taught on that.

__________________
http://gameofthrones.me.uk/images/d52a6ed54940a9f9f8166c7ca89fac8a.gif
oldvirgin is offline   Add to oldvirgin's Reputation Reply With Quote
Old 20th May 2013, 12:32 PM   #7 (permalink)
Moderator
workingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to all

 
workingtoohard's Avatar
 
Posts: 9,462
Join Date: Aug 2008
Likes: 140
Liked 174 Times in 130 Posts
Gender:

Re: anyone know how to solve this?

vector is a gradient -1 slope. assuming brightest source will be the one ray that shines directly through the circle and at the origin of the circle, with radius of circle at 2, we will be looking at a line of length 2 stretching from the circle origin to the edge of the circle at a 45 degree angle.

with that, position at edge of circle will be:
x = 2sin45
y = 5 - 2sin45

btw, i cannot remember sin or cos, but it doesnt matter because 45 degree. hmm thought my answer will be same as whitecorp. maybe i dont understand the Phong thing correctly.

__________________
*Have fun in SGClub but pls READ the RULES, Report Bad Posts and Give Reputation to Good Ones!*

Last edited by workingtoohard; 20th May 2013 at 12:33 PM.
workingtoohard is offline   Add to workingtoohard's Reputation Reply With Quote
Old 20th May 2013, 01:19 PM   #8 (permalink)
one more year to go...
oldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to all

 
oldvirgin's Avatar
 
Posts: 9,903
Join Date: Aug 2011
Likes: 91
Liked 348 Times in 298 Posts
Gender:

Re: anyone know how to solve this?

Originally Posted by workingtoohard View Post
vector is a gradient -1 slope. assuming brightest source will be the one ray that shines directly through the circle and at the origin of the circle, with radius of circle at 2, we will be looking at a line of length 2 stretching from the circle origin to the edge of the circle at a 45 degree angle.

with that, position at edge of circle will be:
x = 2sin45
y = 5 - 2sin45

btw, i cannot remember sin or cos, but it doesnt matter because 45 degree. hmm thought my answer will be same as whitecorp. maybe i dont understand the Phong thing correctly.
wow thats amazing.

x = 2sin45

thats the same as sqrt 2

y = 5 - 2sin45

if its 5+2sin45 then its the same as his answer.

__________________
http://gameofthrones.me.uk/images/d52a6ed54940a9f9f8166c7ca89fac8a.gif
oldvirgin is offline   Add to oldvirgin's Reputation Reply With Quote
Old 20th May 2013, 04:21 PM   #9 (permalink)
Experienced SGClubber
whitecorp is a glorious beacon of lightwhitecorp is a glorious beacon of lightwhitecorp is a glorious beacon of light

 
whitecorp's Avatar
 
Posts: 2,404
Join Date: Jul 2009
Likes: 0
Liked 211 Times in 174 Posts
Gender:

Re: anyone know how to solve this?

Originally Posted by workingtoohard View Post
vector is a gradient -1 slope. assuming brightest source will be the one ray that shines directly through the circle
Excuse me? Shining through?

whitecorp is offline   Add to whitecorp's Reputation Reply With Quote
Old 20th May 2013, 05:41 PM   #10 (permalink)
one more year to go...
oldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to alloldvirgin is a name known to all

 
oldvirgin's Avatar
 
Posts: 9,903
Join Date: Aug 2011
Likes: 91
Liked 348 Times in 298 Posts
Gender:

Re: anyone know how to solve this?

Originally Posted by whitecorp View Post
The full solutions to the problem. Hope it helps. Peace.


eh the last eqn is = 0

2*sqrt2 - 2*sqrt2 + 10 - 10 = 0 and not -20 leh

__________________
http://gameofthrones.me.uk/images/d52a6ed54940a9f9f8166c7ca89fac8a.gif

Last edited by oldvirgin; 20th May 2013 at 05:45 PM.
oldvirgin is offline   Add to oldvirgin's Reputation Reply With Quote
Old 20th May 2013, 10:02 PM   #11 (permalink)
Moderator
workingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to all

 
workingtoohard's Avatar
 
Posts: 9,462
Join Date: Aug 2008
Likes: 140
Liked 174 Times in 130 Posts
Gender:


Originally Posted by whitecorp View Post
Excuse me? Shining through?
for a viewer standing at origin, light have to shine through wat, else how he see.
Posted via Mobile Device

workingtoohard is offline   Add to workingtoohard's Reputation Reply With Quote
Old 20th May 2013, 10:04 PM   #12 (permalink)
Moderator
workingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to allworkingtoohard is a name known to all

 
workingtoohard's Avatar
 
Posts: 9,462
Join Date: Aug 2008
Likes: 140
Liked 174 Times in 130 Posts
Gender:

Re: anyone know how to solve this?

ohhh... lol... origin. not center of circle.
Posted via Mobile Device

workingtoohard is offline   Add to workingtoohard's Reputation Reply With Quote
Old 21st May 2013, 12:41 AM   #13 (permalink)
Experienced SGClubber
whitecorp is a glorious beacon of lightwhitecorp is a glorious beacon of lightwhitecorp is a glorious beacon of light

 
whitecorp's Avatar
 
Posts: 2,404
Join Date: Jul 2009
Likes: 0
Liked 211 Times in 174 Posts
Gender:

Re: anyone know how to solve this?

Originally Posted by oldvirgin View Post
eh the last eqn is = 0

2*sqrt2 - 2*sqrt2 + 10 - 10 = 0 and not -20 leh
My bad, made a substitution error.

Here are the rectified workings for the final part:


Peace.


Last edited by whitecorp; 21st May 2013 at 01:06 AM.
whitecorp is offline   Add to whitecorp's Reputation Reply With Quote
Reply

Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Solve this without the use of a calculator megaman123 Math Help 16 22nd May 2013 10:04 PM
pls help me solve these 2 Qs! goodkat Math Help 20 6th May 2009 12:57 AM
help to solve some P6 maths here raysusan School Life 69 23rd October 2008 11:50 PM
How to solve these?? serileong88 Pet Lovers 15 8th October 2008 02:42 PM
Anyone know how to solve this? jelloman Mobile Talk 5 15th March 2007 11:40 AM

» Sponsors
Watch Free Movies Online
Celebrity Gossip
Food Delivery

» Facebook Fans
» What's Going On?
Title, Username, & Date
[PMD-pedestrian rules] Singapore Court judges are high handed and biased or court rep
Ritter Sport chocolate recalled due to undeclared allergen
Aoki Hagane no Arpeggio: Ars Nova
I really hate my mother!!!
Mum's Kitchen Catering and Cherish Delights get licences suspended after nearly 40 people...
Transcend RDF9K2 All-in-One Card Reader
Transcend ESD250C, a portable SSD that’s super classy
Stupid court of appeal gives red light running driver who hit pedestrian 15% discount
How PAP exploited racial differences to impose FASCIST rule over Singapore.
Up to S$7250 of government $ misused for buying each vote in Singapore?
Funky Fields organic vegan spreadable recalled due to 'undisclosed allergen'
100 hawksbill turtles released into the sea after rare hatching on Sentosa
Inspirational Songs
Repost comment.
MOH, SFA investigating after 18 typhoid fever cases in 3 weeks
By militarily invading Hong Kong, Xi Jingping is setting in motion, the wheels of nuc
Deng XiaoPing original vision for HKG- China reunification was for the two to unite a
HSA warns against three products
Warning : Blacklist buyer/adopter Alert
512GB Transcend 830S M.2 SSD Review
Featured Photos
by marisoljames322
· · ·
Member Galleries
20359 photos
13619 comments
by marisoljames322
· · ·
Member Galleries
20359 photos
13619 comments
by pdsubbu
· · ·
Member Galleries
20359 photos
13619 comments
by Vikas Dhar
· · ·
Photography
35 photos
36 comments
by aaudreygan
· · ·
Guy Photos
1581 photos
946 comments
by aaudreygan
· · ·
Girl Photos
4351 photos
28606 comments
by a8paris
· · ·
Guy Photos
1581 photos
946 comments
by a8paris
· · ·
Guy Photos
1581 photos
946 comments
by aaricia
· · ·
Girl Photos
4351 photos
28606 comments
by aaricia
· · ·
Girl Photos
4351 photos
28606 comments

 

All times are GMT +8. The time now is 12:50 PM.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright© 2004-2013 SGClub.com. All rights reserved.