Q9 (2 Viewers)

[sinsolja]

For the Tap A tap B question , the two marker ( part ii )

Anyone get 8 Liters as the diffrence?

 

[rolpsy]

yeah

 

[sinsolja]

Excellent
ty

 

[Tasha270494]

howw.

 

[sinsolja]

Well part i told you the diffrence was T in the rate of flow , and the tap was open for 4 minutes

so i done the integral of T with limits from 4-0 and that gave me 8 :S

 

[Tavin]

Was doing it as the paper was taken away...

For the first bit, did anyone derive and state because B' was less than A' A would've been always greater?

 

[sinsolja]

All you needed to do was sub in a value.

 

[rolpsy]

howw.

i'm pretty sure part (i) was a hint for:



which can now be integrated

 

[sinsolja]

i'm pretty sure part (i) was a hint for:



which can now be integrated

Too much work for two marks.

 

[someth1ng]

I got 4 - t is the time (4) and you sub it in.

 

[rolpsy]

Too much work for two marks.

i always seem to overcomplicate things

although, integrating t from 0 to 4 seems not enough for 2 marks (especially Q9)

 

[_deloso]

For the Tap A tap B question , the two marker ( part ii )

Anyone get 8 Liters as the diffrence?

I got that too but my mates said the given equation was the rate at which the liquid is falling. So you needa integarte that to get the volume and sub t=4 after..

 

[_deloso]

i'm pretty sure part (i) was a hint for:



which can now be integrated

yup I think this is right. After integrating, you sub t=4 and get the volume

 

[someth1ng]

Oh, now I understand the question - LOL I might get 1 mark if lucky...

 

[ngoetz]

So its 8 right?

 

[sinsolja]

yup I think this is right. After integrating, you sub t=4 and get the volume

Intergrate both ,find how many L each tap produced , and find the difference?
WHY?

They give you the difference for a reason so when you integrate the diffrence in flow, you will get the liters.

 

[mathemalia]

ugghh...I didn't integrate =/

3 marks there.

 

[AgentGreeny]

All you needed to do was sub in a value.

I am not POSITIVE, but subbing in may not get full marks as it only shows that the increase is t for THAT value, I took the (rate for A)-(rate for B) and after all the working you prove the difference is t.

Hehe I got (ii) wrong tho saying 10 instead of 8 tho

 

[forkandspoon]

how do you prove part (i)? rate of flow for A is greater than B??

 

[someth1ng]

how do you prove part (i)? rate of flow for A is greater than B??

Do A-B?