M2 Elasticity

I was unsure what the 2 values of extension on part b actually meant?
I've attached my working for a and b.

I was stuck on c earlier but it's now solved (so you can ignore that picture)

(edited 8 years ago)

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Reply 1

thefatone

Why TeeEm gone? :/ no more tagging him ;(

@Student403 @Zacken @anyone else who can help

Reply 2

Student403

I'm so braindead right now so I can't help right now sorry :sad:

Reply 3

ghostwalker

The e= -0.6 is your original starting position.

And e=0.4 refers to the new position.

Note that e would not necessarily have been positive, although it is in this case.

I would do it with e being below B, i.e. assume it is a positive extension. The resulting quadratic I get has 0.6 and -0.4 as the two solutions. 0.6 being the starting position, and -0.4 being the desired position. Negative implies it's above B. And new length is original length plus extension = 1 + (-0.4) = 0.6 as desired.

Edit: As you have it, you have a positive quantity in a negative direction, which can be confusing.

(edited 8 years ago)

Reply 4

Zacken

Original post by thefatone

Why TeeEm gone? :/ no more tagging him ;(

@Student403 @Zacken @anyone else who can help

You want help with mech, tag ghostwalker.

Reply 5

ghostwalker

Original post by Zacken

You want help with mech, tag ghostwalker.

Best not - I'm not going to be as active as I was, and there are others on here with more extensive mechanics experience.

Edit: But thanks for the thought. :smile:

Reply 6

thefatone

Original post by Zacken

You want help with mech, tag ghostwalker.

did you study stats or mechanics in school? or little bit of both?

Reply 7

Zacken

Original post by thefatone

did you study stats or mechanics in school? or little bit of both?

I am studying stats and mech, on my own, though. I'm doing S1-3, M1-3.

Reply 8

thefatone

Original post by Zacken

I am studying stats and mech, on my own, though. I'm doing S1-3, M1-3.

o.o i wish i could be like you :/

Reply 9

Zacken

Original post by thefatone

o.o i wish i could be like you :/

You really don't. :tongue:

Reply 10

Student403

Original post by thefatone

o.o i wish i could be like you :/

**Replace the word "cat" with "Zacken"

[video="youtube;JI7cIYcnTRU"]https://www.youtube.com/watch?v=JI7cIYcnTRU[/video]

Reply 11

Zacken

Original post by Student403

**Replace the word "cat" with "Zacken"

You calling me a pussy? :teehee:

Reply 12

Student403

Original post by Zacken

You calling me a pussy? :teehee:

I don't think everybody wants to be a pussy :rofl:

Reply 13

thefatone

Original post by Zacken

You really don't. :tongue:

hmmm :/ i'd like to know a bit of both though...

Reply 14

Zacken

Original post by thefatone

hmmm :/ i'd like to know a bit of both though...

So self-study.

Reply 15

thefatone

Original post by Zacken

So self-study.

i dunno though i might if i have spare time to do so .... atm i'm really bad at chem and even worse at physics so i gotta get those up to scratch first :/

Reply 16

maggiehodgson

Original post by ghostwalker

Best not - I'm not going to be as active as I was, and there are others on here with more extensive mechanics experience.

Edit: But thanks for the thought. :smile:

Sorry to hear you won't be as active - I wondered why had hadn't seen your name for a while. So I would just like to thank you for all the replies you have made to my mechanics posts through the years. I eventually got as far as 1/2 way through edexcel M3 but I think I've reached my limit but I do continuue look at mechanics posts.

Enjoy whatever you will be doing instead of TSR.