That space question...

[ZanyCat]

Two quick queries.

1) What the hell were they trying to test with it? Our ability to copy out ridiculously ugly expressions? How well we can transcribe horrible equations?

2) I was lazy. I said let = *whatever was inside the brackets of the sin and cos* and worked from there. Would I be penalised for this? Seems unfair if they want us to write out the full thing every single friggin' time.

[datfatcat]

To be safe, I copied everything lol!

[Biceps]

To be safe, I copied everything lol!

same but i was swearing at VCAA in my head.

[datfatcat]

To be safe, I copied everything lol!

same but i was swearing at VCAA in my head.

VCAA: Um How can we torture our students this year? um...aha LARGE AND LONG NUMBERS heehe!

[BigAl]

I I was gonna do the same...but once I had so much time spare and last question as this one..I copied everything

[Niskii]

That was SO uncool!

Needed multiple lines for what would normally be just one line of working :|

[Biceps]

If it wasn't for that question i would have been confident that i done well. But now i have no idea how i went.

[Biceps]

To be safe, I copied everything lol!

same but i was swearing at VCAA in my head.

VCAA: Um How can we torture our students this year? um...aha LARGE AND LONG NUMBERS heehe!

HAHAHA it's funny because it is so freaking true!!!

[kensan]

Could you guys prove that the acceleration and velocity were perpendicular? Couldn't see half the numbers on the screen so I could have made an error anywhere for that working lol

[InsaneMcFries]

There was so much working that I just said v(t).a(t)=0, then wrote out the vector components multiplying, then said that equals zero.

[Special At Specialist]

Could you guys prove that the acceleration and velocity were perpendicular? Couldn't see half the numbers on the screen so I could have made an error anywhere for that working lol

I just said v(t) dot a(t) = -6400sin(u)cos(u) + 6400sin(u)cos(u) where u = pi*(1.3t - 0.1)
Therefore v(t) dot a(t) = 0
Therefore they are perpendicular

[Biceps]

There was so much working that I just said v(t).a(t)=0, then wrote out the vector components multiplying, then said that equals zero.

i did that too . They took it too far with that question

[HighLatency]

There was so much working that I just said v(t).a(t)=0, then wrote out the vector components multiplying, then said that equals zero.

I actually got mad when they made us do that in such a tiny amount of working space.
Just wrote out v(t).a(t) = 0 and "Put it into calc. P.S give more space plox"

[TheRajinator]

part a) i got t=1/13 and i substituted that into 6800cos(pi(1.3*t-0.1)-6400 and kept getting -5703.68 which seems like a ridiculous answer. what did everyone else get?

[DJing]

part a) i got t=1/13 and i substituted that into 6800cos(pi(1.3*t-0.1)-6400 and kept getting -5703.68 which seems like a ridiculous answer. what did everyone else get?

NOOOO!!! omg I got 400km