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Author Topic: Physics CIE help  (Read 12286 times)

Offline tmisterr

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Physics CIE help
« on: April 08, 2010, 08:52:11 am »
explain Q 9,11, and 15, im getting different answers to what they are giving constantly!!
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nid404

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Re: Physics CIE help
« Reply #1 on: April 08, 2010, 10:32:10 am »
9) D
a=v-u/t
V at M1= at1
V at M2= at2
v2=u2 +2as
v2-u2=2as

(at2)2-(at1)2=2as (s=h)
a=2h/ (t22-t12)
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Offline tmisterr

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Re: Physics CIE help
« Reply #2 on: April 08, 2010, 10:40:19 am »
Thanks, wat bout the other 2?
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nid404

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Re: Physics CIE help
« Reply #3 on: April 08, 2010, 10:45:35 am »
11) sum of momentum before collision=sum of momentum after collision

ball A
mVA- mUA
ball B
mVB-(-mUB)(opp  direction )

p of ball A=ball B (for elastic collision)

mVA- mUA=mVB-(-mUB)
VA-UA=VB+UB
VA-VB=UB+UA
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nid404

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Re: Physics CIE help
« Reply #4 on: April 08, 2010, 10:48:12 am »
15) this one is A

the resultant of the horizontal and vertical components will be equal to the third component in the opp direction
If you notice the rest, they have no such corelation...
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Offline tmisterr

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Re: Physics CIE help
« Reply #5 on: April 08, 2010, 12:45:07 pm »
thanks a alot for your help with number 9 and 15!! but for number 11, why do you assume that the balls are of the same mass? and isn't it that kinetic energy is conserved not that momentum is equal for both bodies? in ur cause if A and B are of the same mass this means that vA and vB are equal so that they have equal momentum.
How bout if you use relative speed of approach is equal to relative of recoil?? this is how im doing it but getting a different answer
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Offline halosh92

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Re: Physics CIE help
« Reply #6 on: April 08, 2010, 02:37:09 pm »
2007 oct/nov
q2 d part ii
why dont we subtract the forces and then multiply the velocity? why do we have to add here exactly?
plz someone HURRY ??? ??? ??? ???
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline halosh92

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Re: Physics CIE help
« Reply #7 on: April 08, 2010, 03:48:05 pm »
2007 oct/nov
q5a
could someone plz sketch it :SSSS
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Offline astarmathsandphysics

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Re: Physics CIE help
« Reply #8 on: April 09, 2010, 12:21:11 am »
1st thing in morning
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Offline halosh92

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Re: Physics CIE help
« Reply #9 on: April 09, 2010, 07:32:51 am »
AS cie physics
paper 2 2007 may/june
Q1
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Offline halosh92

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Re: Physics CIE help
« Reply #10 on: April 09, 2010, 08:38:51 am »
Quote from: halosh92 on April 09, 2010, 07:32:51 am
AS cie physics
paper 2 2007 may/june
Q1 and 5d i, ii
Q6 aii ................why isnt it 14+E...why do we subtract here?
« Last Edit: April 09, 2010, 09:47:28 am by halosh92 »
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Offline astarmathsandphysics

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Re: Physics CIE help
« Reply #11 on: April 09, 2010, 11:46:38 am »
Which part? If you are asking which is better - that scale or a uniform linear scale I think it is the one cos it is easier to tell from zero so you are less likely to run out of petrol
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Offline halosh92

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Re: Physics CIE help
« Reply #12 on: April 09, 2010, 02:28:11 pm »
Quote from: astarmathsandphysics on April 09, 2010, 11:46:38 am
Which part? If you are asking which is better - that scale or a uniform linear scale I think it is the one cos it is easier to tell from zero so you are less likely to run out of petrol
ok and could you answer the rest of the questions plz..its rili rili URGENT
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Offline tmisterr

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Re: Physics CIE help
« Reply #13 on: April 09, 2010, 02:36:38 pm »
hey astar can you answer q 11 in oct/nov paper 1 attached on the first post
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Offline astarmathsandphysics

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Re: Physics CIE help
« Reply #14 on: April 09, 2010, 05:21:11 pm »
Will do it when I get home in 2 hours
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