Physics, Chemistry and Biology: Post your doubts here!

Muaaz Iqbal

Muaaz Iqbal

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Zainab Magdy said:
Hey I need help with 0625_s14_qp_32.pdf question 3B physics :D
Click to expand...
That is Easy ! Look
Gravitational Potential energy = Mass x gravitational accelaration x Height

So, According to question

G.PE is 16.2 Joules
Mass is 2.0 kg
Gravitational Accelaration is = 10

16.2=2.0 x 10 x Height
16.2= 20 x height
16.2/20 = Height
Height = 0.81 meters

Hope you understand ! If you do have Any doubt feel free to ask
 
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AtemisDelta

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Hi!
I understand this example is talking about dilution... But I haven't really understood the math and the figures used. The conversion of units.
It would be immense if someone could help me out with this!

Thanks...
Dark Destination F.Z.M. 7
 
F.Z.M. 7

F.Z.M. 7

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If you want a real life scale then:
1000 cm3 = 1 litre (As in 1 litre fruit juice)
10cm3 = 10ml (About 2 teaspoon)
1cm3 is a drop here but this drop would be a pretty big one relative to normal drops, like a square of 1cm by 1cm by 1cm

But this just basically is trying to say that atoms and molecules are small and that color requires many particles and not a single one. Maths is not very important I guess.
 
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AtemisDelta

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F.Z.M. 7 said:
If you want a real life scale then:
1000 cm3 = 1 litre (As in 1 litre fruit juice)
10cm3 = 10ml (About 2 teaspoon)
1cm3 is a drop here but this drop would be a pretty big one relative to normal drops, like a square of 1cm by 1cm by 1cm

But this just basically is trying to say that atoms and molecules are small and that color requires many particles and not a single one. Maths is not very important I guess.
Click to expand...
Thanks...
I thought so too.. About the Math.
 
16Mahira

16Mahira

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Hello. does anyone have le markscheme for biology nov 2002.
if yes, can it be uploaded please.
btw are there past papers & markschemes for papers berfore 2002?

thx
 
Ayesha Asif333

Ayesha Asif333

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Agm123 said:
Sure!
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Calculate the heat required to convert 5kg of ice at -20 C into steam at 100 C. The specific heat capacities of water and ice are, respectively, 4200 and 2100 J/(kg K) ; The specific latent heat of fusion of ice is 340 000 J/kg , and the specific latent heat of vaporization of water is 2.3* 10^6 J/kg.

The final ans is 15510 000 J. see if u get it right
 
Hamna naseer

Hamna naseer

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Salam
Just have a small doubt in june 2014 p31 qtn2(e) (0610)
Comparing the test tube 1 and 4 there was a point in ms that nothing in (cell wall of ) bacteria B for lysosome to digest. What does this sentence means....can someone plzz explain this sentence... :)
 
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Ayesha Asif333

Ayesha Asif333

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Hamna naseer said:
Salam
Just have a small doubt in june 2014 p31 qtn2(e) (0610)
Comparing the test tube 1 and 4 there was a point in ms that nothing in (cell wall of ) bacteria B for lysosome to digest. What does this sentence means....can someone plzz explain this sentence... :)
Click to expand...
Waalikum Assalam
Lysozyme has the ability to break down bacterial call walls, mostly the walls that contain carbohydrates
But type B bacteria was not killed so this shows that it has become resistant, it has its cell wall made up of some different substance which lysozyme can not break/digest
 
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