Biology; Chemistry; Physics: Post your doubts here!

[Faizan Muhammmad]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w10_qp_22.pdf
Plus how do you claculate ques 2 bii

density of water x height of water x g =density of oil x height of oil x g

 

[Faizan Muhammmad]

-And in question number 4 the answer is that resistance INCREASES with increase in temperature but I've read it somewhere that resistance would decrease with increase in temp!

that is the case of thermistor

 

[Mahnoorfatima]

density of water x height of water x g =density of oil x height of oil x g

Yeah but why are we equalizing both of the densities??

 

[Faizan Muhammmad]

-And how to know the frequency in qs 5?

one wave takes 4 divisions = 0.8 ms = time period
frequency=1 / time period

 

[Faizan Muhammmad]

Yeah but why are we equalizing both of the densities??

coz pressure is same

 

[Faizan Muhammmad]

Yeah but why are we equalizing both of the densities??

we arent equalizing densities but the whole formula

 

[Faizan Muhammmad]

Plus in a CRO while drawing the waves how will we know how much boxes do we have to draw for the xaxis as in the time base situation?

the scale will be given or will be calculate able

 

[Mahnoorfatima]

one wave takes 4 divisions = 0.8 ms = time period
frequency=1 / time period

By one wave you mean????

 

[Faizan Muhammmad]

-Qs no 9 : how to draw the rays? wouldnt it get refracted ??

they wont get refracted, it is a mirror
draw a perpendicular normal at mirror then taking angle of incidence same as reflection draw the reflected ray

 

[Mahnoorfatima]

they wont get refracted, it is a mirror
draw a perpendicular normal at mirror then taking angle of incidence same as reflection draw the reflected ray

Oh LOL right. Thats what I do when I panic Plus in the next part when it says mark where would the image be formed??? Then what do I do?

 

[Faizan Muhammmad]

By one wave you mean????

yep

 

[Faizan Muhammmad]

Oh LOL right. Thats what I do when I panic Plus in the next part when it says mark where would the image be formed??? Then what do I do?

extend the reflected rays backward

 

[Mahnoorfatima]

Thank you so much for clearing up my probs!

 

[Faizan Muhammmad]

Thank you so much for clearing up my probs!

no problem

 

[exploded diper]

http://papers.xtremepapers.com/CIE/...(Calculator Version) (4024)/4024_w08_qp_2.pdf
q 4. d
and
http://papers.xtremepapers.com/CIE/...(Calculator Version) (4024)/4024_s08_qp_1.pdf
q.24.iii
how to do both????

 

[Faizan Muhammmad]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w08_qp_2.pdf
q 4. d
and
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s08_qp_1.pdf
q.24.iii
how to do both????

that should be in maths thread but wait

 

[Faizan Muhammmad]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w08_qp_2.pdf
q 4. d

(30/120)*(29*119)

 

[Faizan Muhammmad]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s08_qp_1.pdf
q.24.iii
how to do both????

(7/50)*(6/49)

 

[exploded diper]

that should be in maths thread but wait

oo sry bout tht

 

[exploded diper]

(30/120)*(29*119)

okay so inthtis question he multiplies your answer with 30 on denominator and numerator ......