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Physics, Chemistry and Biology: Post your doubts here!

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hey !!
quick question :-
a)Calculate and predict the results of mono hybrid crosses involving 1:1 and 3:1 ratios.
b)Explain co dominance by reference to the inheritance of ABO blood groups-phenotype. A, B, AB and O blood groups and genotypes I^A , I^B and I^O .
 
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http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s10_ms_31.pdf

q-4 d y not catalyst ?

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_ms_31.pdf

q-3 a ii

q-8 c is this ok ?

when switch is connected to position C charge is being stored ans ammeter reading becomes zero.

q-9 part b ii WAt I s happening?

q-10 b detector at C

cud be beta becuz if I place my hand like Flemings hand

north to south in to paper

then from from positive to negative so beta

q-11

1st straight horizontal line

Second like full wave and third like this

http://www.schoolphysics.co.uk/age1...cs/text/Cathode_ray_oscilloscope/images/6.gif?

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w09_qp_31.pdf

q-3 part f is this alright >this is beacuz after a certain limit the spring loses its elasticity limit

question 8 my object was not somewhere between F2 and lens

so I loose all marks ? L

q-10 I did this 22,000 – 7.5

but in ms they do it twice becuz two wires ? :p



http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s09_qp_3.pdf

q-5 bii ( very weak in maths L)

q-6 part b ii how cum it is = (i)

q-7 hehe….wat does this mean

Total penalty for use of ‘particles’ rather than ‘molecules’ is 1 mark.?

q-9 a wat Is bettr

http://upload.wikimedia.org/wikipedia/commons/5/51/Waveform_halfwave_rectifier.png

OR
http://www.jimdirectory.com/1/53_2.jpg ;)

q-9 plz explain if possible! :D

q-11 part b how come its 2 marks

if I write from top to the bottom of page so its 1 mark gained? :p



PLZ AND THANKU
Phoenix Blood;)
 
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http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_31.pdf

3)a)ii)
Area of all 4 pistons combined = 0.02*4 = 0.08 m^2

Sinces force = pressure*area, total upward force =

100 000 * 0.08
8000 N

8)c) No, the other way. The ammeter reading falls as capacitor charges.

9)b)ii) There's a surplus of +ve charges at Y, so electrons from the earth will flow towards it, and balance the charge (i.e. region Y will now have equal number of positive and negative charges)

10) This is always the case in a magnetic field:

img_full_47092.gif


11)

images
 
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http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w09_qp_31.pdf

q-3 part f is this alright >this is beacuz after a certain limit the spring loses its elasticity limit

question 8 my object was not somewhere between F2 and lens

so I loose all marks ? L

q-10 I did this 22,000 – 7.5

but in ms they do it twice becuz two wires ? :p
-----------------------------------------------------------------------------------------------------------------------------------------------
3)f) exceeds, not looses.
8) Just draw something like this, with proper measurement to the left of the lens

images


10) Yes.
 
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http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s09_qp_3.pdf

q-5 bii ( very weak in maths L)

q-6 part b ii how cum it is = (i)

q-7 hehe….wat does this mean

Total penalty for use of ‘particles’ rather than ‘molecules’ is 1 mark.?

q-9 a wat Is bettr

--------------------------------------------------------------------------------------------------------------------

5)b)ii) Because the speed if halved, the mass of air is too.
7500/2 = 3750 kgs.
(1/2*m*v^2 = k.e.)- relating speed, force and mass.

6)b)ii) Area doesn't affect pressure. Only height, density, and gravity does. ( Pressure = h*d*g)

7) No, its not for 1 mark, but if you're using it, you're not gaining any marks :p

9)a) What's better what?

images
 
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http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s09_qp_3.pdf
q-9 plz explain if possible! :D

q-11 part b how come its 2 marks

if I write from top to the bottom of page so its 1 mark gained? :p
---------------------------------------------------------------------------------------------------------
9) And if not possible? :p
Trace out the path in which the direction of current isn't blocked by the diode, and goes from red to black.

11) Take it man :p
one maybe for making reference to the page, and the other for the direction. Or else, they take it as a tough question, so give 2 generous marks :p Why, one has to apply fleming's here too.
 
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What math? You've now less speed. Infact, now you own half the speed, so you'll be pushing half the amount of air.
If i pump my fists in the air with 50 N, i'll push aside maybe 200 kgs worth of air.
But if i do the same thing with less force, say about 25 N, i'll only be pushing 100 kgs.
Call speed force here?
 
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What math? You've now less speed. Infact, now you own half the speed, so you'll be pushing half the amount of air.
If i pump my fists in the air with 50 N, i'll push aside maybe 200 kgs worth of air.
But if i do the same thing with less force, say about 25 N, i'll only be pushing 100 kgs.
Call speed force here?
-_____________________________________-
feel like the dumbest person alive
 
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