Physics, Chemistry and Biology: Post your doubts here!

[shoaib672002]

Hope that helped you!

Thanks a Lot!!

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─╚═╝╚╝╚╝╚╝╚╝╚╝╚╝╚╝╚╝╚══╝

 

[Karim Nabil]

Thanks a Lot!!

─╔╗─╔╗──────────╔╗
╔╝╚╗║║──────────║║
╚╗╔╝║╚═╗╔══╗╔═╗─║║╔╗╔══╗
─║║─║╔╗║║╔╗║║╔╗╗║╚╝╝║══╣
─║╚╗║║║║║╔╗║║║║║║╔╗╗╠══║
─╚═╝╚╝╚╝╚╝╚╝╚╝╚╝╚╝╚╝╚══╝

my pleasure!

 

[Karim Nabil]

View attachment 39783 View attachment 39784




ANSWER PART C ONLY

R1*3A/2L=R2*A/L
R1*3A/2L=R2*A/L
R1*3/2=R2
R1*3=R2*2
R1/R2=2/3

RATIO=2/3

 

[Karim Nabil]

View attachment 39782

it is only explaining you how to do this, no angles were measured!!
Hope that helped you!

 

[shameema]

biology doubt!
the ans is b but how ? :/

 

[Sweet!]

what is controlled diffussion?

 

[Sweet!]

biology doubt!
the ans is b but how ? :/

which year's paper is this?

 

[shameema]

which year's paper is this?

oct/nov 2008
i think i figured it now

 

[Phoenix Blood]

Explain this please.

 

[Sweet!]

Explain this please.

the HIV+ children have a weaker immune system than normal children as HIV weakens lymphocytes. due to this, they have higher chances of catching diseases and infections. the baby doesn't receive any of the mother's antibodies as he/she isn't being breast fed. so if the milk is not sterile, the chances of the baby catching infections increases even more which is dangerous

 

[Sweet!]

oct/nov 2008
i think i figured it now

how??

 

[shameema]

how??

you have to measure with the ruler the shortest length from the air space to the inside of the RBC( the nucleus like thing inside) . so we find it is around 7.5 mm. Then we conver mm to micro meters and then divide by the magnification i.e 2500 . then we will get the ans
hope it helped

 

[Awesome12]

you have to measure with the ruler the shortest length from the air space to the inside of the RBC( the nucleus like thing inside) . so we find it is around 7.5 mm. Then we conver mm to micro meters and then divide by the magnification i.e 2500 . then we will get the ans
hope it helped

yup that is the method

 

[Sweet!]

you have to measure with the ruler the shortest length from the air space to the inside of the RBC( the nucleus like thing inside) . so we find it is around 7.5 mm. Then we conver mm to micro meters and then divide by the magnification i.e 2500 . then we will get the ans
hope it helped

yeah thanks

 

[Awesome12]

View attachment 39783 View attachment 39784




ANSWER PART C ONLY

Current flow in X is
I1 = 60/230
=0.26 A
V= IR
230 = 0.26 (R)
R1 = 882 ohm

Since X and Y are made of the same material, they have the same resistance, BUT...
Y has half length
Thus
R2 = 882/2
R2 = 440

But it has 1/3 cross sectional length
R2= 440*3
1322.5 ohm

Current in Y...
230/1322.5
I2 = 0.17 A

Find the ratio

 

[Heba A.Moety]

oct/nov 2008
i think i figured it now

i dont think u r taking biology 0610?!

 

[Heba A.Moety]

Why are synapses even needed in the co-ordinative system ? Like, what's the purpose of slowing the nerve impulses down?

i read that it is purposed that the neurones are not continuous yet still can communicate with each other.
if u got any other explaination plz tell me

 

[shameema]

i dont think u r taking biology 0610?!

na its 9700

 

[Sweet!]

i read that it is purposed that the neurones are not continuous yet still can communicate with each other.
if u got any other explaination plz tell me

yeah thats right! when an impulse reaches it, synapse releases neurotransmitters that stimulates impulse in the next neurone.

 

[Heba A.Moety]

This is an easy way to learn reactivity series of metals:
Poor Silly Boys Can Marry Any Zombi If They Like How Can Mothers Save Pretty Girls?
Potassium
Sodium
Barium
Calcium
Magnesium
Aluminium
Zinc
Iron
Tin
Lead
Hydrogen
Copper
Mercury
Silver
Platinium
Gold
"Hope it Helped"