Biology; Chemistry; Physics: Post your doubts here!

[snowbrood]

Really? Wow ... you saved me mate. Really thanks , i was doomed until you told me that .

hey answer that prism question that u asked from us a couple of days back

 

[multixamza01]

i did answer it . check the previous posts .

 

[farahdar]

so guys two months or less than that now,whose still preparing and whose completely prepared and doing Past papers ! And who are the people who havent even touched anything

Barely touched anything.

 

[Duanoor]

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no its is why dont u get it.. its too simple wet air has more water molecules per unit volume doesnt it ?? water molecule weights 18 doesnt it.. see take it as this u have 1 cm3 of wet air that have 98% water molecules so lets consider the mass of 1cm3 of wet air to be that of the water i.e 18... while i have 1 cm3 of dry air it has 98% nitrogen and oxygen molecules there mass combined is 28+32 so which is denser its so simple now​

yeah!thnx a lot!!

 

[Duanoor]

Evaporation occurs at any temp whereas boiling occurs at 100 degree celcius. evaporation takes place at surface wheras boiling takes place throughout the liquid.

and yes...boiling occurs when vapour pressure becomes equal to the external pressure...

 

[Duanoor]

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no its is why dont u get it.. its too simple wet air has more water molecules per unit volume doesnt it ?? water molecule weights 18 doesnt it.. see take it as this u have 1 cm3 of wet air that have 98% water molecules so lets consider the mass of 1cm3 of wet air to be that of the water i.e 18... while i have 1 cm3 of dry air it has 98% nitrogen and oxygen molecules there mass combined is 28+32 so which is denser its so simple now​

and that also means that dry air is denser than wet air?

 

[Khalil Rizvi]

Thank You

 

[ROCK THE FIRST]

Does anyone have notes regarding Radioactivity?

 

[snowbrood]

and that also means that dry air is denser than wet air?

afcourse girl

 

[aleezay]

does any one have complete notes on physics?
and any tips regarding physics atp?

 

[beeloooo]

guys can any 1 tell me what conversions occur with different types of bacteria such as nitrifying , denitrifying , decay , etc >>>??? plz need help urgently tomorrow is my mock !!

 

[Madridista]

Guys anyone have chemistry notes for edexcel olevel ?

 

[Tharindu]

Describe the effects of balanced and unbalanced forces on a body..........I don't know this please help

 

[Tharindu]

Define linear magnification

 

[smzimran]

Describe the effects of balanced and unbalanced forces on a body..........I don't know this please help

Balanced forces keep an object either at rest or in motion with constant velocity. (Newton's first law of motion)
Unbalanced forces cause an object to move with an acceleration 'a' where F = ma , 'm' is the mass of the object and 'F' is the resultant force on the object. ((Newton's first law of motion)

 

[smzimran]

Define linear magnification

It is the process of making an object look larger than it really is.
Linear magnification = Image size/ Object size

 

[Tharindu]

Describe the ways in which a force may change the motion of a body

 

[Tharindu]

Describe how to verify the principle of moments

 

[Duanoor]

afcourse girl

Describe the effects of balanced and unbalanced forces on a body..........I don't know this please help[/qu

afcourse girl

if we talk abt water...thn wtr is less dense than air?but yr in water molecules are more closer thus in per unit volume mass will be greater...and so density will be greater...???

 

[smzimran]

Describe how to verify the principle of moments

The sum of the clockwise moments must equal the sum of the anti clockwise moments.
The forces must be balanced.