SAC Help?

[MickyMouse!]

Hey guy, I've got my application task coming up and I've got some pracitce questions that are apparently "similar" to the real SAC. If anyone could please help me with these questions it would be much appreciated. Sorry its so much, but this is just ONE question from the practice SAC I've been given. I've attempted some, but would like someone to work through theses so I can make corrections ect.

1. When Vacuum packed, 500 grams of ground coffee takes up a volume of 990cm^3. Starbuck is desining a new style of package that is to be a rectangular prism.

a). The rectangular prisim has a base whos dimensions are to be golden rectangles. THis means that the width is x cm and the length is p.x cm, where P= (1+ the sqaure root of 5) divided by 2. Show algebraically that the height of the prism is given by the expression

h= 990/p.x^2

I wrote that since LxWxH=volume , then H = Volume/LxW , and since the volume is 990, and w=x and L= p.x, therefore h= 990/p.x^2



b). Now list the expressions for all three dimensions of the prism in terms of x.
-here i just re-arranged the quations and solved for the dimension they asked for.

L=volume/LxH        w= Volume/L /h             H=990/p.x^2



Sorry about posting a bulk of the questions, but if anyone could double check the above that would be great, if I know the above is correct I should be able to solve the rest. .

[Phy124]

I've attempted some, but would like someone to work through theses so I can make corrections ect.

Hi there, would you mind editing in your working out for the questions you have attempted. For those you are yet to attempt your possible thought process towards how the question could be done might also be useful.

I can't speak on behalf of everyone, but I become quite hesitant in answering a bulk of questions when the person hasn't shown any attempts at the question, that's all

Also, try to refrain from creating threads with text such as "urgent!" in the title or using capital letters for entire words. The more relevant the title is to the actual post the more chance it will have of being answered, something like "Volume & Surface Area Application Tasks Help" (I haven't actually read the questions but these words seem frequent throughout the post) may be more appropriate.

Sorry if this post sounds critical, but if you follow what I have told you, you will be able to get a lot more out of this resourceful site (y)

[Cloud Nine]

Hi there, would you mind editing in your working out for the questions you have attempted. For those you are yet to attempt your possible thought process towards how the question could be done might also be useful.

I can't speak on behalf of everyone, but I become quite hesitant in answering a bulk of questions when the person hasn't shown any attempts at the question, that's all

Honestly, if I see a badly formatted question that's over 100 words, I don't bother reading it lol.

[pi]

Don't mean to have a couple of mods nit-picking here, but for future reference:

These are rules applying specifically to posting. They'll probably be placed at the top of each subforum. For now, suggestions and comments are welcome.


Posting

• Avoid ALL-CAPS in thread titles and posts, unless using a proper acronym (e.g. "VCE", "ATAR").
• Avoid putting "Read this need help urgently" or similar in your thread title. Everyone is entitled to the same amount of attention.

[Phy124]

1. When Vacuum packed, 500 grams of ground coffee takes up a volume of 990cm^3. Starbuck is desining a new style of package that is to be a rectangular prism.

a). The rectangular prisim has a base whos dimensions are to be golden rectangles. THis means that the width is x cm and the length is p.x cm, where P= (1+ the sqaure root of 5) divided by 2. Show algebraically that the height of the prism is given by the expression

h= 990/p.x^2

I wrote that since LxWxH=volume , then H = Volume/LxW , and since the volume is 990, and w=x and L= p.x, therefore h= 990/p.x^2

Looks good to me 

b). Now list the expressions for all three dimensions of the prism in terms of x.
-here i just re-arranged the quations and solved for the dimension they asked for.

L=volume/LxH        w= Volume/L /h             H=990/p.x^2

It might be necessary to let , such that;







Looks like you're on the right track, nice work!

If you have any queries relating to the questions which follow from these don't hesitate to ask.