Solutions (2 Viewers)

[thomdale]

nice 12/12 q4 thats better. hey with ur solns for quetion 2a) isnt it 2/... not 10/... and if im wrong why isnit it 2/....

the 5x differentiates to 5, which is timesed by the 2 to form 10

oh alright fair enough like a function of a function rule
thanks

 

[jaafar]

hi phoenix88.
can u plz put the answers for q3/(a+d)
thanx

 

[rippletzhou]

really?!?!?! near 40??? maybe i did something right?!?!
lol
i think i got roughly for (ii) between 40 and 56 or something, and then got 49 or so for (iii)....but as i said, just really made it up!
thanks for 3dii).....now i know...lol stupey

i think i got the same result as u did. anyway, i am not sure whether it was right or wrong. just made them up. but i am glad there's someone who got the same answer as i did.

 

[tim_dawborn]

isnt Q4c)iii)

x^2 = ay – 3a^2?
not x^2 = a(y-3)?

yea my bad -- doin these as fast as i can so mistakes will happen lol

 

[thunderdax]

I wrote my answers for Q6+7 in the book. Here they are:
6a)ii) 0.01
iii) 0.92
b) i) 7041m, forgot to write time.
ii) 40.82<t<55.76
iii) 49.72
7ai) 102.59m
ii) 20.53m/hr.
and (b) was all show thats.

 

[haboozin]

yea my bad -- doin these as fast as i can so mistakes will happen lol

just do the solutions to all of em - put it in one word file and give it to Timbk to put it on the first post

i hate this searchign everywere to see how much i got

 

[jaafar]

I wrote my answers for Q6+7 in the book. Here they are:
6a)ii) 0.01
iii) 0.92
b) i) 7041m, forgot to write time.
ii) 40.82<t<55.76
iii) 49.72
7ai) 102.59m
ii) 20.53m/hr.
and (b) was all show thats.

can u plz post the worked answers for q3 parts a and d

 

[richz]

I wrote my answers for Q6+7 in the book. Here they are:
6a)ii) 0.01
iii) 0.92
b) i) 7041m, forgot to write time.
ii) 40.82<t<55.76
iii) 49.72
7ai) 102.59m
ii) 20.53m/hr.
and (b) was all show thats.

nice answers, got similar q6 answers

 

[tim_dawborn]

answers 6

i will compile them into one file at the end

 

[LuKiN]

fuck.... looking at those answers... fuck! too many silly mistakes.

 

[stv_87]

c iii is WRONG your second last line to last stuffed up, u should have timesd the 3a by a making it x squared equals a(y-3a)

 

[DRAGONZ]

Damnnnnn I'm pissed off.

Staying up to 1am last night finishing the 2001 paper (which I got 79/84 in) f*cked me up.

My mind wasn't there today, and I was going slow and generally not thinking enough about my answers.

I had to skip 6 (ii) and (iii) to go onto question 7.

I promptly got home, took the test out, and did those two parts inside five minutes.

I had 66/67 up to that point because of a mindblock in 3d(ii).

After doing badly in four unit, I reckon I needed a final mark of about 97 or 98 for three unit.

... And I can't see a final mark of 77/84 (I got 11/12 for question 7, I'm pretty sure) getting me that 98

Oh well. If only I'd gone to bed an hour earlier ... or taken Red Bull before the exam

 

[stv_87]

6 b iii shouldnt the inequality sign be reversed like 350squared greater than the equation u have notless than

my calculator is screwed i did your exact equation in the exam and it came up with 0.66something, lol i left my answer in working then just wrote o.79 after so tick i guess. thats the world of computers for u

 

[DRAGONZ]

*Double post*

Sorry.

 

[DRAGONZ]

6 b iii shouldnt the inequality sign be reversed like 350squared greater than the equation u have notless than

No. Maximum velocity is 350m/s. He has to eject himself before it reaches 350m/s ... well actually, right as it hits 350.

So for that to happen, 350 </= root [ (horizontal velocity)^2 + (vertical velocity)^2 ]

Goddamn so simple.

 

[tim_dawborn]

and question 7 -- brain is dying atm so b)ii) has no answer
feel free to correct it

doin question 3 now for those who wanted it

 

[stv_87]

so is the rocket accelerating as it goes closer to the ground cause i reacted as though it was slowing down, i stuffed that anyway i did your method but ended with 483 seconds
thats what u get for dropping physics forgetting gravity

 

[darkwarrior2]

Omg

OMG, i got .123... for question 7ai) as the answer and then i thought it couldnt be cos its kind of similar to .1 radians....and i crossed it out >< ! ffffffffffffffffffffffffffffffffffffffffffffssssssssssssss !!!!!!

 

[datacore]

question 7aii

dr / da = 1/2 x 2050 sec^2 (a/2)

then u get 20.55m/hour

thats what i had

 

[renya]

OMG, i got .123... for question 7ai) as the answer and then i thought it couldnt be cos its kind of similar to .1 radians....and i crossed it out >< ! ffffffffffffffffffffffffffffffffffffffffffffssssssssssssss !!!!!!

even if you cross an answer out dont the markers mark it?