Physics, Chemistry and Biology: Post your doubts here!

[IGCSE STUDENT]

Guys please help, in Physics May June 2010 paper 31, I can't understand questions 11(b) and 5(d). Anyone please help?

 

[za Shadow]

q1d ii) distance= speed x time
= 1.2 x 0.6 = 0.72/2
= 0.36m
since the trolley moves backwards and forwards

q5 c) mass x Specific Heat Latent = Power x time
m x L = P x t
(16.3 - 2.1) x L = 40 x (2 x 60) time has to be in seconds
14.2 x L = 40 x 120 simplify to get L
L = 338 J/g

thankss a looottt

BUT

in q 1 d) how did u know its moving backward and forward even though why did u divide by 2?????????? WE SHOULD ADD THE MINUTES (4) AND ADD THE MASSES

AND

in q 5 c) why did u subtract 16.3 - 2.1 and why did u use 2 minutes not 4 minutes??????

THANKS AGAIN

 

[sma786]

what do u mean by only write metal the ms said "non transition metal/named metal e.g. sodium (1)" ?????????



THANKS A LOOOOTT



question 5 its not calcium how did u know??????

THANKSSSSSS VERRRRRRYYYY MUCHHHHH

It says its a white solid n all ..

 

[sma786]

Y d0sent physics die .. ? =[

 

[thats_me]

todays chemistry paper 6 was great! question 5 answer was Copper Carbonate and gas was CO2

COPPER :O :O wasn't it ammonium? :S

 

[sma786]

The solid was calcium carbonate, confirmed -.- it says WHITE SOLID ..

 

[thats_me]

The solid was calcium carbonate, confirmed -.- it says WHITE SOLID ..

ummmmm but wat about the part (d) the test was for ammonia :S

 

[sma786]

ummmmm but wat about the part (d) the test was for ammonia :S

i wrote sm weird thing but so far, that was the only wrong answer i wrote

 

[thats_me]

i wrote sm weird thing but so far, that was the only wrong answer i wrote

oh! thats great u don need to worry thn...

 

[sma786]

oh! thats great u don need to worry thn...

Yeah =] but chemistry n phy p3 are left

 

[sma786]

Anybody have notes for physics paper 3 ? its freaking me outtt ..

 

[thats_me]

Yeah =] but chemistry n phy p3 are left

yeah! :| n i hateeee P3,, btw hav u started preparin for it

 

[sma786]

yeah! :| n i hateeee P3,, btw hav u started preparin for it

Me also, since our english paper but still , nothing is enough for those things

 

[Yousif Mukkhtar]

Anybody have notes for physics paper 3 ? its freaking me outtt ..

Here:
http://www.xtremepapers.com/community/threads/physics-guide.14933/

 

[sma786]

Here:
http://www.xtremepapers.com/community/threads/physics-guide.14933/

Thankyou so much

 

[Yousif Mukkhtar]

I got a slight question guys. Suppose there is an incident ray in the denser medium (glass) and a refracted ray in the rarer medium (air).

And they asked us to find the refractive index in air. Refractive index= sin i (air)/sin r (glass)
I am confused, for "sin i" the angle of incidence here isn't in air.

 

[sma786]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w08_qp_03.pdf
Guys, the first variant, queestion 1 , (a - ii) please explain =[

 

[sma786]

I got a slight question guys. Suppose there is an incident ray in the denser medium (glass) and a refracted ray in the rarer medium (air).

And they asked us to find the refractive index in air. Refractive index= sin i (air)/sin r (glass)
I am confused, for "sin i" the angle of incidence here isn't in air.

Its in air, or glass or water, its still the angle of insidence, the formula is not of air or glass i think

 

[Yousif Mukkhtar]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w08_qp_03.pdf
Guys, the first variant, queestion 1 , (a - ii) please explain =[

This prevents resistance or reduces it. Because the slope makes it move much faster.

 

[Yousif Mukkhtar]

Its in air, or glass or water, its still the angle of insidence, the formula is not of air or glass i think

Thanks.