Higher Physics '08 Official Thread

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the problem I have is I look at the questions, and think I don't know what to do, but when I asked for help, it was pretty straightforward, which is annoying!

Reply 21

Rach L

Physics is awesome! I'm not too confident on unit 3 though... I just need to sit down and go through my notes and learn it :s-smilie:

My class are fantastic - me and 2 friends built our teachers a 'real' wheatstone bridge http://img385.imageshack.us/img385/4439/p1010003nq1.jpg

It's made out of wheat and stone (hence being 'real'). Yes we are geeks :biggrin:

Reply 22

ryan92

wheatstone bridge :O
I think I have forgotten what that is.
Is that the circuit with the 4 resistors
r1 over r2 = r3 over r4 ?

Reply 23

Cw.x

Yes thats the one :smile:

Reply 24

bekahchu

I'm impressed I could remember offhand what MOSFET stood for, though I should considering I'm doing AH this year.

Good luck to everyone though.

Reply 25

Cw.x

Can someone please help me with the 2006 question 2.

Really stuck at it thanks x

Reply 26

Meteorshower

Cw.x

Can someone please help me with the 2006 question 2.

Really stuck at it thanks x

Th speed of the ball does not have direction, so if you have the horizontal and vertical compents of velocity does that help you figure out what the speed will be?

Reply 27

Musty_Elbow

yeh sure.

its a vector with two components.

Just draw a right angled triangle, and put 30 on the vertical, and 40 on the horizontal.

Pythagoras gives you 50ms!

Reply 28

Cw.x

Ermm... no lol sorry I'm not very good at this area of physics.

Reply 29

Cw.x

Oh Yeahhh i get it now thankuuu :smile:

Reply 30

Musty_Elbow

its just the combined vertical and horizontal.

Forget about angles. just a right angled triangle. Vertical component = 30ms whn landing

horizontal = 40ms when landing

40^2 + 30^2 = 2500

therefore v = 50ms

Reply 31

Meteorshower

When you have components of velocity you can always make a triangle and use pythagoras and trigonometry to find what the others are, just think of it like a triangle and you should be fine :smile:

Reply 32

Musty_Elbow

Thre are so many questions which use the triangle method

Reply 33

Du Ba

I was thinking of crashing physics next year. Is this wise or is it to hard to crash?

Reply 34

sjames06

Du Ba

I was thinking of crashing physics next year. Is this wise or is it to hard to crash?

If your good at maths go for it. Once you know where to get the figures from and manipulate the formulas its relatively straight forward.

Reply 35

Meteorshower

I would say physics is one of the easiest subjects to crash, you'd be fine with it :smile:

Reply 36

kerry_1

can anyone tell me about mosfets cause we never had time to finish the course :s

Reply 37

Meteorshower

kerry_1

can anyone tell me about mosfets cause we never had time to finish the course :s

Mosfets are Metal Oxide Field Effect Transistors that are semi-conductors which only conduct when there is a "gate" voltage of 2v or more. There are three parts, the source, the gate and the drain. There is more you need to know but i reccomend looking it up on scholar if you have it, they have nice pictures. I couldn't learn it just through text