Physics Help HERE ONLY !!

[astarmathsandphysics]

I dont think it really matters It could be that the paper is tilted

[Hope]

Hey..may anyone please clarify why in November 2008 Qn c), the value of the ice melted is = 14.2??
The question makes it seem like 2.1 g of ice melted..

Also, qn 6b), they've inverted the equation to find the refractive index.. the 30 degrees angle is like the incident angle, however they've assumed it's the refractive angle. I'm not sure why, but is it because, if the angle we're trying to calculate, were to emerge into the glass, that's the angle it would form?

Help please 

[astarmathsandphysics]

everywebsite in asia is slow from where I am. Is anyone else noticing this esp with sites hosted in malaysia eg bitspyder.net

[Hope]

anyone?

[Ghost Of Highbury]

Hey..may anyone please clarify why in November 2008 Qn c), the value of the ice melted is = 14.2??
The question makes it seem like 2.1 g of ice melted..

Also, qn 6b), they've inverted the equation to find the refractive index.. the 30 degrees angle is like the incident angle, however they've assumed it's the refractive angle. I'm not sure why, but is it because, if the angle we're trying to calculate, were to emerge into the glass, that's the angle it would form?

Help please 

u do it like this
n = sin i / sin r
1.49 = sin 30 / sin r
sin r = sin 30/ 1.49
sin r = 0.3355
r = sin(-1) 0.3355
r = 19.6 degree

i think the markscheme is wrong
they have applied the incorrect formula
it is n = sin i / sin r
but they have used n = sin r / sin i
------------------------------------
for nov 08 Q c.>(the ice one)
shogun has explained it clearly
here https://studentforums.biz/index.php/topic,1798.360.html

[Ghost Of Highbury]

see the whole post
shogun explained it really well

[nid404]

w8 was the gun thingy

[Ghost Of Highbury]

no idea
nid
i too was wondering abt that

pretty funny
lol..

hey nid ... chk out the question i have just answered... is it correct??
i think the markschemes wrong
nov 08 paper 3 1st variant Q 6.)b.)

[sweetie]

9.81 is the accleration due to gravity I useed weight=9.81*mass

ok now i got it
thanx 4 da help
gud luk

[Hope]

thank you so much Adi, for directing me to that!
And wonderful explanation Shogun, thank you

[goin4dakill]

Hey..may anyone please clarify why in November 2008 Qn c), the value of the ice melted is = 14.2??
The question makes it seem like 2.1 g of ice melted..

Also, qn 6b), they've inverted the equation to find the refractive index.. the 30 degrees angle is like the incident angle, however they've assumed it's the refractive angle. I'm not sure why, but is it because, if the angle we're trying to calculate, were to emerge into the glass, that's the angle it would form?

Help please 

Hey, so i see someone answered ur second question but for the first one..I got a little mixed up with that as well.
What they are asking is for the amount of water that was melted.. AND that is in the beaker. So therefore u gotta do..18.4- 2.1, which then equals 14.2.
I dont know if that was understandable, i mean im remembering the question of the top of my head.
By the way, was it me, or was the paper a little hard. What do u think Hope??? Noone will answer this question -.-

AND ALSO I THINK THE MARK SCHEME WAS WRONG!!!!!! I thought that too, because for sure it is Sini/sinr

[Eamyzz]

hii can any1 explain da motor thingie 4 me  

[Ghost Of Highbury]

thank you so much Adi, for directing me to that!
And wonderful explanation Shogun, thank you

welcome  

[Hope]

It was a moderate paper goinfordakill, I really do hope this year's won't be hard

[Eamyzz]

may u plz answer me ppl