last minute question

[Zebra]

2007 question 5.

WHY DO YOU USE CONSTANT ACC FORMULA?//

WHERE DOES IT TELL YOU THE ACC IS CONSTANT??


why can't you just use initial v, final v, time to work out acc?

[Zebra]

my fucking goodness....

no sleep tonight!

[dc302]

Are you talking about exam 1? The acceleration is definitely constant, because there are no forces acting on it except friction (and friction is a constant force here).


edit: and yes you can, and you ARE using the initial/final v and time.

edit2: what I meant by my first edit is:

the constant accel formula is this:   v=u+at. That is precisely using the initial and final velocities and time taken ie, a = (v-u)/t

[jane1234]

Ha just did this exam.

Constant forces = constant acceleration.

You are not given t so you have to use v^2 = u^2 + 2as where s = 3, u = 4 and v = 0.

[dc302]

Ha just did this exam.

Constant forces = constant acceleration.

You are not given t so you have to use v^2 = u^2 + 2as where s = 3, u = 4 and v = 0.

Oops, my mistake. Read 3 seconds instead of 3m hah

[Zebra]

Ha just did this exam.

Constant forces = constant acceleration.

You are not given t so you have to use v^2 = u^2 + 2as where s = 3, u = 4 and v = 0.

Oops, my mistake. Read 3 seconds instead of 3m hah

same.

okay. i thought this shit was new guys. thanks! and good luck...

if you guys are not asleep, 2006 question 4)a) (exam 1) ?

i used lami's and got it wrong!

[Zebra]

got it. thanks to itute... !

[Andiio]

When you prove a rectangle, do you have to prove ALL angles are right angles?

[AleksIlia]

When you prove a rectangle, do you have to prove ALL angles are right angles?

No just one pair of sides afaik.

[ellecee]

You can also prove that the diagonals are of equal length

[Andiio]

So say for ABCD, would you be able to attain full marks if you just proved angle(ABC) and angle(BAC) are right angles?

[Andiio]

You can also prove that the diagonals are of equal length

How would you differentiate a square from a rectangle then, if you just prove that the diagonals are equal in magnitude? (I'm thinking that this is a stupid Q which I know the answer to )

[davidle_10]

You can also prove that the diagonals are of equal length

How would you differentiate a square from a rectangle then, if you just prove that the diagonals are equal in magnitude? (I'm thinking that this is a stupid Q which I know the answer to )

Lol, to differentiate a square from a rectangle the magnitude of all lengths of the square are the same.

[ellecee]

You can also prove that the diagonals are of equal length

How would you differentiate a square from a rectangle then, if you just prove that the diagonals are equal in magnitude? (I'm thinking that this is a stupid Q which I know the answer to )

You don't. Squares are merely a special rectangle.

[Zebra]

if asked to prove something is a kite how would you guys do it?