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Physics: Post your doubts here!

M

Muskan Achhpilia

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ZaqZainab said:
It says when it passes 1 post it has a speed of 10
so we take the initial speed as 10 and the 1st post as the starting point now how much are you traveling afert the first post? just 1 more post you getting it right don't consider teh distance between the 0 post and 1st cause that not even counted you don't even know the speed at 0 post so that's why 1st post
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Oh!Now i get it,Thanks for the time and effort!
 
ZaqZainab

ZaqZainab

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meerul264 said:
Can someone also help me with June 2008 P2?

Q 6 full (problem is I don't know what happen when switch S2 is closed or open)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s08_qp_2.pdf
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when S2 is closed the "path of least resistance" will take up most of the current
so the current would flow through S2 rather than through B cause here B has resistance
for (i) we use power= VI
we don't have I so we replace I with V/R which we take from the equation R=V/I
power=v^2/r
R=38.4
ii) they are talking about total poser
so if S1 open there is no power you get this one right because the circuit is not complete
S1 and S2 closed as i said current always takes easier path so it will not go through B so in P=IV I=O the P is also 0 for B but then the current flows through A so its 1.5k+0=1.5k
if all of them are closed here again we will take power of B as 0 and if you see we have A and C in parallel Total power=P1+P2......... SO 1.5+1.5
S1 is closed so so we have A and B in series 1/total power = 1/p1 + 1/p2 +............
so 1/total power= 1/1.5 +1/1.5
total power =0.75
here s1 and S3 are closed so we have A and B parallel to C ie (AB) parallel to C for parallel Total power=P1+P2.........
and we already found AB which is 0.75 so now we just need to add 1.5
 
ZaqZainab

ZaqZainab

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The Godfather said:
magnanimous is no more chem master, he replied wrong answer n ZaqZainab got the correct one :D
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Don't call me a master and then start calling me stupid cause i make mistakes cause i am a human (even the chem geniuses are not chem masters)
I believe in only one masted and thats Allah
P.s you be like take a joke will yeah :p
 
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The Godfather

The Godfather

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ZaqZainab said:
Don't call me a master and then start calling me stupid cause i made a mistake cause i am a human i make mistakes (even the chem geniuses are not chem masters)
I believe in only one masted and that Allah
P.s you be like take a joke will yeah :p
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Ps means ?
Yup humans make mistakes!!!! :D But I was just teasing magnanimous... :) :p :LOL:
 
meerul264

meerul264

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ZaqZainab said:
Don't call me a master and then start calling me stupid cause i make mistakes cause i am a human (even the chem geniuses are not chem masters)
I believe in only one masted and thats Allah
P.s you be like take a joke will yeah :p
Click to expand...

You remind me of my awesome maths teacher Sheikh Pierre :cry: He also says about the same thing when he talks about mathematics and all.
 
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