P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE

[nid404]

nov 02
Q5(b)(part1) how do u calculate the phase difference in this one 
plz help me!!!!!!

[zxcvbnm]

THANKYOU SOOOOOO MUCH NID!!!!!!

[halosh92]

in series:
extensions are added
in parallel :
extensions divided by number is springs

in parallel:
spring constants are added
in series:
i have no idea wat happens  

could someone check if this is correct or wrong?

could someone just check this.

[nid404]

could someone just check this.

the spring constant changes accordingly...the extension changes inversely.

I had answered a similar question...I'll look for it

[sizbeauty]

THANKX ALOT NID...GOD BLESS U DEAR

[nid404]

I just need God's blessings 

Thank you

[halosh92]

alright thx nid
one more question when an object is rotating due to a couple its accelerating as its changing direction right?
or not because the couples are balanced forces?

[nid404]

Yes there is acceleration....but we don't have circular motion for AS...

[halosh92]

Yes there is acceleration....but we don't have circular motion for AS...

  *sigh*
thx and wat about the previous question u said u did it before
sorry for the trouble

[nid404]

The threads are really long...I'll really have to look 

[halosh92]

1st variant
Q5c
could someone give it in more details plz?
Q7b
is it going to pass straight? or is it going to deviate at a smaller angle?

one more question: 4 pie L/T^2
if we found the total percentage uncertainity of L/T^2
then dont we have to multiply by 4
thx

[ruby92]

3bi) the gradient is d/t^2
3bii) s= ut + 1/2at^2
u=0
s=1/2at^2
s/t^2  * 2 = a          (making a as the subject)
substitute the gradient instead of s/t^2 and multiply by 2  thats all


voila   !

thnkx  

in m/j 2005 3b
according to the ms we dont change g-->kg only for this quiestion?

[TJ-56]

Nov 09 v2
4 (c) (ii) 2. & 3.
Nov 08
6 (b)
7 (b) (ii)
May 08
6 (b)
Nov 07
3 (b) (ii)
4 (c)
5 (a)
May 06
2 (b)
2 (c) (iii)
4 (b) (i)
5 (b)
Nov 05
2 (b)
7 (b) (iii)
Nov 03
5 (c)
Nov 02
5 (b) (i)
Nov 01
3 (b)
ANY help would be deeply appreciated
thanx for any help in advance!

[The SMA]

nov 2007
Q4d

halosh, can u explain to me please for Q4a, how do we know from graph if brittle, ductile or polymeric?
and also Q4c.

[halosh92]

halosh, can u explain to me please for Q4a, how do we know from graph if brittle, ductile or polymeric?
and also Q4c.

Q4a
brittle: when the ultimate tensile stress occurs at the elastic limit ( thats when it breaks)
ductile: it can stretch after the elastic limit ( it becomes plastically deformed) then it some point it breaks
plastic: they usually have a low stress value and a large area under the graph , in the begiinng they are ductile but as stress increases they become plastically deformed

Q4c: stress= force/area
first find the minimum area of the tube from the graph , the highest stress is 9.5 * 10^8
area= (1.9 × 103) / (9.5 × 108)
= 2 * 10^-6
maximum area is given in the question
so subtract the minimum area from the maximum