Question 30 (2 Viewers)

[shaziee7]

Can anyone please clarify these answers. From what i can remember:

30a

(i) 7780340
(ii) A = 0.4w
(iii) 8.5
(iv) 8.2m/s
(v) Somewhere around 130-135 % increase. Can't remember exactly

 

[DJ696]

Can anyone please clarify these answers. From what i can remember:

30a

(i) 7780340
(ii) A = 0.4w
(iii) 8.5
(iv) 8.2m/s
(v) Somewhere around 130-135 % increase. Can't remember exactly

(i) correct.
(ii) the formula i did was A = 20000w^3 - 60/100 x T
(iii) I got 8.8 because 14.6 - 5.8 = 8.8.
(iv) correct.
(v) 33%

 

[shaziee7]

I said 133%. Does it matter if u say 33% or 133% increase

 

[DJ696]

I said 133%. Does it matter if u say 33% or 133% increase

not to sure, but it increase by 33 percent because 100 percent is maximum haha

 

[shaziee7]

and also for percentage error, i think i put 2cm instead of 2%. Considering it was 1 mark, will i lose it even though i had the correct working but put cm instead of %

 

[DJ696]

and also for percentage error, i think i put 2cm instead of 2%. Considering it was 1 mark, will i lose it even though i had the correct working but put cm instead of %

percentage error was 2%. if its one mark then you'll lose most likely.

 

[shaziee7]

sigh.. part two of that question was between 17.5 x 25.5 and 16.5 x 24.5. That seem right?

 

[Ballinnn]

Can anyone explain the very last question? o the paper. Cause i think i done it wrong

 

[DJ696]

sigh.. part two of that question was between 17.5 x 25.5 and 16.5 x 24.5. That seem right?

nope it suppose to be 24.5 x 17 and 25.5 x 17.. i think?

 

[hjhj]

hi

for 30a)ii) i had 0.4(20000w^3), i think your one misses out the 20000 and ^3

sorry i can't remember what iii and iv were (the questions) :/ and i got 33% not 133%, because if it was over 100% it would of meant that it would double... which i don't think it did...

um and i think shaziee7's

between 17.5 x 25.5 and 16.5 x 24.5.

is correct! (because its both the upper and lower areas)

Can anyone explain the very last question?

i'll try... :/

4.1/41= 0.1 (so that means there is 0.1 litres of oil left and 40x0.1 (4 litres) of petrol)

So now we need to get it down to 25:1 instead of 40:1

So 4 litres of the 4.1 left are petrol, so we need to get this 0.1 of oil to equal 1/25= 4%

So 4% of 4 litres = 0.16

0.16-0.1= 0.06 litres of oil to be added. and I THINK thats the answer...

hope that helps...