2 Unit Revising Marathon (2 Viewers)

[SpiralFlex]

Re: 2 Unit Revising Marathon HSC '10

Nice pun. Yes, it would be faster.

The object's limiting velocity occurs when

So

 

[mangoz]

Re: 2 Unit Revising Marathon HSC '10

The object's limiting velocity occurs when

So

Yarp lol. Btw got any more questions? Your questions actually aren't generic so im forced to think :S

 

[SpiralFlex]

Re: 2 Unit Revising Marathon HSC '10

Yarp lol. Btw got any more questions? Your questions actually aren't generic so im forced to think :S

I will see if I can find any good ones online.

 

[nightweaver066]

Re: 2 Unit Revising Marathon HSC '10

Try this.. Could be easy or hard. Try not to google anything..

The sides of a triangle are (2x-1), (x+1) and (11-x).

Prove that

 

[Hermes1]

Re: 2 Unit Revising Marathon HSC '10

Try this.. Could be easy or hard. Try not to google anything..

The sides of a triangle are (2x-1), (x+1) and (11-x).

Prove that

is this like a hsc related question. or is it just a lateral thinking type question.

 

[SpiralFlex]

Re: 2 Unit Revising Marathon HSC '10

You would have to form an inequality with the three equations, there probably is one more step. I am still figuring out how.

 

[nightweaver066]

Re: 2 Unit Revising Marathon HSC '10

is this like a hsc related question. or is it just a lateral thinking type question.

It was in one of my 2-unit tests i had at school. Not sure if it could be placed in the HSC or not though.

You would have to form an inequality with the three equations, there probably is one more step. I am still figuring out how. What if takes a negative value?

can't be negative as it is a side of a triangle.

 

[SpiralFlex]

Re: 2 Unit Revising Marathon HSC '10

For the first case,



From the rule of the inequality of a triangle.



Similarly,






Hence,



Is this the working? Seems tricky.

 

[nightweaver066]

Re: 2 Unit Revising Marathon HSC '10

For the first case,



From the rule of the equality of a triangle.



Similarly,






Hence,



Is this the working? Seems tricky.

Correct.

The sum of two sides of a triangle must be greater than the third.

 

[SpiralFlex]

Re: 2 Unit Revising Marathon HSC '10

Correct.

The sum of two sides of a triangle must be greater than the third.

Very weird question. I could not imagine any school asking that in the HSC. Going to go for a bit. Goodnight.

 

[mangoz]

Re: 2 Unit Revising Marathon HSC '10

For the first case,



From the rule of the inequality of a triangle.



Similarly,






Hence,



Is this the working? Seems tricky.

Yup that's what i did lol

 

[MrBrightside]

Re: 2 Unit Revising Marathon HSC '10

You guys ask the hardest questions lol, where do you get them from? Cambridge? I'd expect that time / displacement question from spiral Flex to be something like Qs 9 or 10 in the HSC exam. I'm aiming for a band 5 at least. My internals are strong enough to withstand a solid band 5. I just need to get roughly 80% or so in externals. hmm maybe 80% is too high, prob 70% ish

 

[SpiralFlex]

Re: 2 Unit Revising Marathon HSC '10

you guy ask the hardest questions lol, where do you get them from? Cambridge? I'd expect that time / displacement question from spiral Flex to be something like Qs 9 or 10 in the HSC exam, lmao so doomed to fail those questions. I'll prob run out of time. I'm aiming for a band 5 at least. My internals a strong enough to withstand a solid band 5. I just need to get roughly 80% or so in externals. hmm maybe 80% is too high, prob 70% ish

You can do better. Come on study hard.

 

[MrBrightside]

Re: 2 Unit Revising Marathon HSC '10

You can do better. Come on study hard.

ahaha Fine, I edited my post so I stay positive enough to push on. I'm going through my year 11 parabolic locus type questions...god it's been a year since I touched this material. Trying to study it, its coming back slowly.

I'm trying to give it 100% I want to get my trials back so I can see where I went wrong ><

 

[MrBrightside]

Re: 2 Unit Revising Marathon HSC '10

 

[asianese]

Re: 2 Unit Revising Marathon HSC '10

i) After picking the first sock there are 7 socks. There is only 1 sock left of the same colour, out of the 7, so there are 6/7 chances that he will not get a match

ii) 8/8 (first sock) * 6/7 * 5/6 = 5/7

iii) (8/8 * 1/7 * 5/6) + (8/8 * 6/7 * 1/6) = 11/42

i'm probably wrong I'm terrible at prob...

 

[Timothy.Siu]

Re: 2 Unit Revising Marathon HSC '10

u did ii) wrong, and think iii) is wrong too unfortunately.

 

[hscishard]

Re: 2 Unit Revising Marathon HSC '10

i) After picking the first sock there are 7 socks. There is only 1 sock left of the same colour, out of the 7, so there are 6/7 chances that he will not get a match

ii) 8/8 (first sock) * 6/7 * 5/6 = 5/7

iii) (8/8 * 1/7 * 5/6) + (8/8 * 6/7 * 1/6) = 11/42

i'm probably wrong I'm terrible at prob...

What tim said
What if the 2nd sock matches the 3rd?

 

[nightweaver066]

Re: 2 Unit Revising Marathon HSC '10

ii. 20/21
iii. 1/21

Terrible at probability too. Will need to learn it asap..

 

[asianese]

Re: 2 Unit Revising Marathon HSC '10

Can someone explain the method? Thanks