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PHY5 Jun 05 Thread watch

1. How did people find it.,.standrdising is gonna b LOw on that 1...wat was the condition for the grav potential Q???
2. yer, not the easyest paper

I said height must be measured from a point relative to both, e.g the center of earth since if measured to surface, this would not be constant
3. the object's weight sounds like a better answer, or more exactly the gravitational field strength, g.

What did people get for the charge stored on the capacitor?
4. the equivalent capacitor was 4uF
Therefore the pd across on of them is 24/2 (because the 2 were the same)
Therefore using .5*C*V^2
.5 * 4uF * 12^2
=288uC
5. was it CHARge
6. Ufk
7. Charge, for sure.
8. (Original post by mackin boi)
was it CHARge
had to work yout ccharge - i and peopls in my school got 48 micro C

I found phy 5 easier than phy 4 - think i did good

was one prob:

It was ok i think...few things i was confused on - teh reading on the scale for the first question - I did the sum of the weight and the centrapetal force, but not suer wheth i was right in adding it - was a 4 mark qeutsion so thought using just F=mg was not right

how'd you guys find it?

PK
9. (Original post by mockel)
Charge, for sure.
darn i dids enrgy
10. phy5 was so easy! I'm so happy, phy4 was really hard for me though. I got the same answer as phil too, i used 2 methods to make sure it was correct. 6 marks on transformer was a gift and the practical/graph experiments.
11. u had to show that the three circles around the earth were the same hieght from each other i.e. r 2r 3r from the earths surface
12. (Original post by mackin boi)
u had to show that the three circles around the earth were the same hieght from each other i.e. r 2r 3r from the earths surface
really? - i thought it was an inverse proportion - i.e. teh radius of the circles increse with every equiipotentail - well thats what i did

phil
13. i put it as inverse square aswell , equipotetntials get more spread out.
14. But they said "with the equipotentials an equal distance from each other" or something, didn't they?
15. Can't remember the question, was it equipotentials of equal g.p.e.

Therefore, it must be an inverse square law. I lost 2 marks on the explannation bit i think, but that's about all of the marks i lost i hope. I blagged it about making sure equipotentials are not too far out and the Earth's mass needs to stay the same lol. What did everyone else write?
16. thats wat i put as well, but equipotential lines spread out further as you move away from the earth so im not sure.
17. Oh right. Maybe it was =\
18. i asked ma teacher and the lines had to be equidistant from one another
19. (Original post by mockel)
But they said "with the equipotentials an equal distance from each other" or something, didn't they?
lol...yes...that didn't imply the physical distane between them! i think it meant the magnitude of the equipotentials (teh actual differences)

i.e. 1x10^7 is first

2x10^7 is second
3x10^7 is thrid one -etc

phil

at least i hope that's what it meant - if not - them i'm gonna get the kick from oxford
20. (Original post by nas7232)
Can't remember the question, was it equipotentials of equal g.p.e.

Therefore, it must be an inverse square law. I lost 2 marks on the explannation bit i think, but that's about all of the marks i lost i hope. I blagged it about making sure equipotentials are not too far out and the Earth's mass needs to stay the same lol. What did everyone else write?

lol - defiition? said that sperical shell around the earth on which the potential is the same is the same on any point

didn't know what else to write

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