Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Maths Non Calculator Mock 2017

What did everyone get for the depth of the bowl question and how? As well as the vectors question evaluating charlie's methods? Thank you

the question evaluating charlie's methods was that he was wrong because he put W as 1/2 when it should have been 1/3, you just had to state this.

depth of bowl was 22.5

Original post by debateaths

What did everyone get for the depth of the bowl question and how? As well as the vectors question evaluating charlie's methods? Thank you

You had to complete the square

Original post by CraigBackner

You had to complete the square

Or you could use differentiation which was (for me anyway) a lot quicker

Original post by honeydukes01

Or you could use differentiation which was (for me anyway) a lot quicker

how would you differentiate it?

btw the curve of the cross section has the equation y = (x^2/10)-3x and you need to find the depth of the bowl

Original post by honeydukes01

Or you could use differentiation which was (for me anyway) a lot quicker

also how many marks did you get?

Original post by CraigBackner

also how many marks did you get?

y=(1/10)x^2-3x
dy/dx=(2/10)x-3

At minimum point, dy/dx=0
0=(2/10)x-3
2x=30
x=15

Sub x=15 into equation:
y=-22.5
Therefore depth of bowl=22.5

I got all 4 available marks on that question

OP

Thank you. Are there any other difficult questions that you remember the answer to (I can't remember them specifically)

OP

Thank you. Are there any other difficult questions that you remember the answer to (I can't remember them specifically)

Original post by honeydukes01

y=(1/10)x^2-3x
dy/dx=(2/10)x-3

At minimum point, dy/dx=0
0=(2/10)x-3
2x=30
x=15

Sub x=15 into equation:
y=-22.5
Therefore depth of bowl=22.5

I got all 4 available marks on that question

What set was this

Study Forum Helper

Original post by hamagl231

What set was this

The question (in question) was from mock set one.

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