Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




363 posts

Ultimate Geek
+1 received by user: 8


Topic # 229131 8-Feb-2018 21:30
Send private message quote this post

So any of you good at physics out there.

 

My 16 year old has asked me for help with his homework which is WAY over my head :)

 

 

 

So this is is it.....can you explain as well so we can both understand

 

 

 

Ep=1/2 Kx2 .......the two should be above the x as in squared

 

 

 

Use the equation to find K were Ep = 398J x=0.045m

 

 

 

Thanks


Filter this topic showing only the reply marked as answer Create new topic
12 posts

Geek


  Reply # 1953896 8-Feb-2018 21:42
Send private message quote this post

393086.41975308646

 

Maybe..

 

http://calculator.tutorvista.com/physics/545/elastic-potential-energy-calculator.html

 

DFP




363 posts

Ultimate Geek
+1 received by user: 8


  Reply # 1953897 8-Feb-2018 21:44
Send private message quote this post

I need to know how you work it out though ?


 
 
 
 




363 posts

Ultimate Geek
+1 received by user: 8


  Reply # 1953899 8-Feb-2018 21:48
Send private message quote this post

I am more looking for how to re-arrange the equation and show the working as opposed to an internet resouce that just shows you the answer ....sorry


1034 posts

Uber Geek
+1 received by user: 217


  Reply # 1953901 8-Feb-2018 21:50
Send private message quote this post

It's just algebraic manipulation / re-arrangement of formulae by applying inverse operations.

 

 

You want k by itself on one side of the equation, you do this by dividing both sides by "half x squared".

 

 

This should yield k = 2*E / x^2

 

then substitute values for E and x in.

 

 

You might also need units for the constant k which are Joules / metres squared = kg / s^2 = N / m

 

 

I assume this is preparation for AS91168 Year 12 / NCEA Level 2 Physics in which case units are required.

 

 

More information about what is required in the standard here: http://www.nobraintoosmall.co.nz/html/senior_physics/NCEA2_physics_investigation.html

 

 

AS91168 involves a year long portfolio (usually 3 or 4) of investigating relationships in physical quantities.

38 posts

Geek
+1 received by user: 1


  Reply # 1953904 8-Feb-2018 21:57
One person supports this post
Send private message quote this post

So you need to isolate K:

 

1) Multiply both sides of the equation by 2: 2Ep=Kx(squared)

 

2) Divide both sides of the equation by x(squared): 2Ep/x(squared) = K

 

3) K = 2Ep/x(squared)

 

3) K = (2x 398J)/(0.045m)(squared)

 

4) K = 796 / 0.002025 (in units of J/m(squared))

 

5) K = 393086 J/m(squared)


471 posts

Ultimate Geek
+1 received by user: 77


  Reply # 1953909 8-Feb-2018 22:05
Send private message quote this post

16 year olds do physics? I thought it was a secondary school thing...


10622 posts

Uber Geek
+1 received by user: 3292

Trusted
Lifetime subscriber

  Reply # 1953965 8-Feb-2018 22:53
Send private message quote this post

Thanks for reminding me why I hated Physics...!





2286 posts

Uber Geek
+1 received by user: 263

Trusted

  Reply # 1953976 8-Feb-2018 23:17
3 people support this post
Send private message quote this post

Starscream122:

 

16 year olds do physics? I thought it was a secondary school thing...

 

 

16 year olds are in secondary school.





471 posts

Ultimate Geek
+1 received by user: 77


  Reply # 1953983 9-Feb-2018 00:27
Send private message quote this post

sonyxperiageek:

 

Starscream122:

 

16 year olds do physics? I thought it was a secondary school thing...

 

 

16 year olds are in secondary school.

 

 

Lmao my bad!


1575 posts

Uber Geek
+1 received by user: 685


  Reply # 1954002 9-Feb-2018 07:32
3 people support this post
Send private message quote this post

beenz:

 

So any of you good at physics out there.

 

My 16 year old has asked me for help with his homework which is WAY over my head :)

 

 

 

So this is is it.....can you explain as well so we can both understand

 

 

 

Ep=1/2 Kx2 .......the two should be above the x as in squared

 

 

 

Use the equation to find K were Ep = 398J x=0.045m

 

 

 

Thanks

 

 

To me this looks like maths, not physics.





Don't use 'beefstew' as a password.  It's not stroganoff.


6051 posts

Uber Geek
+1 received by user: 941

Trusted
Lifetime subscriber

  Reply # 1954003 9-Feb-2018 07:46
3 people support this post
Send private message quote this post

floydbloke: To me this looks like maths, not physics.

 

 

Physics is just applied maths.

 


1379 posts

Uber Geek
+1 received by user: 703


  Reply # 1954033 9-Feb-2018 08:45
Send private message quote this post

Or put another way: an engineer thinks that the numbers approximate reality; a scientist thinks reality approximates the numbers; a mathematician doesn't realise there is a connection


5519 posts

Uber Geek
+1 received by user: 1593

Trusted

  Reply # 1954036 9-Feb-2018 08:55
Send private message quote this post

Starscream122:

 

16 year olds do physics? I thought it was a secondary school thing...

 

 

 

 

That is secondary school or high school as it is called now.....





Steam: Coil (Same photos as profile here)
Origin: Scranax
Currently playing on PC: Rust, Subnautica, CS:GO, AOE2 HD, BeamNG Drive, BF1.


Filter this topic showing only the reply marked as answer Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Fujifilm X beats its best with new top of the range, high-performance camera
Posted 24-Feb-2018 14:05


One million kiwis affected by cybercrime
Posted 24-Feb-2018 13:58


New Zealanders want to engage with government online and via mobile apps
Posted 24-Feb-2018 13:56


Samsung launches Samsung Max
Posted 24-Feb-2018 13:52


CPTPP text and National Interest Analysis released for public scrutiny
Posted 21-Feb-2018 19:43


Foodstuffs to trial digitised shopping trolleys
Posted 21-Feb-2018 18:27


2018: The year of zero-login, smart cars & the biometrics of things
Posted 21-Feb-2018 18:25


Intel reimagines data centre storage with new 3D NAND SSDs
Posted 16-Feb-2018 15:21


Ground-breaking business programme begins in Hamilton
Posted 16-Feb-2018 10:18


Government to continue search for first Chief Technology Officer
Posted 12-Feb-2018 20:30


Time to take Appleā€™s iPad Pro seriously
Posted 12-Feb-2018 16:54


New Fujifilm X-A5 brings selfie features to mirrorless camera
Posted 9-Feb-2018 09:12


D-Link ANZ expands connected smart home with new HD Wi-Fi cameras
Posted 9-Feb-2018 09:01


Dragon Professional for Mac V6: Near perfect dictation
Posted 9-Feb-2018 08:26


OPPO announces R11s with claims to be the picture perfect smartphone
Posted 2-Feb-2018 13:28



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.