Qualification > Sciences
P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
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:
--- Quote from: halosh92 on June 06, 2010, 02:44:20 pm ---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 ! :)
--- End quote ---
thnkx ;D
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:
--- Quote from: halosh92 on June 02, 2010, 08:20:35 am ---nov 2007
Q4d
--- End quote ---
halosh, can u explain to me please for Q4a, how do we know from graph if brittle, ductile or polymeric?
and also Q4c.
halosh92:
--- Quote from: The SMA on June 07, 2010, 01:32:17 pm ---halosh, can u explain to me please for Q4a, how do we know from graph if brittle, ductile or polymeric?
and also Q4c.
--- End quote ---
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
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