oh..negative zero error count from behind?
last ques

when a liquid chages to vapour at atmospheric pressure, 1 cm3 of the liquid is changed to 1.4 x 10^3 cm3 of vapour. What is the ratio of the density of liquid to the density of the vapour?

This post has been edited by vick5821: Oct 29 2008, 07:16 PM

no lar. its -(0.1-0.03)=-0.07
if its wrong, then im sorry. lol

This post has been edited by pwincess: Oct 29 2008, 07:17 PM

i see wrongly..forgot jor negative error must see from behind not in front

anyone got sej tips? TT

phy ques oso.
ive searched for it in the book and i found it. but hell, i understand nothing.

A brick with mass 2 kg slipped from a worker's hand at height 45 m from the surface of the Earth. What is the momentum of the brick just before it hits the ground?

Both liquid and water have same mass.

mass before evaporation = mass after evaporation
ρ₁V₁ = ρ₂V₂
ρ₁(1) = ρ₂(1.4 x 10^3 cm^3)
ρ₁/ρ₂ = 1.4 x 10^3

density of water : density of vapour = 1.4 x 10^3 : 1

Tonnect91, I have a question about moral essay.

About the 4 sentence format, do we need to write the definition of the nilai such that there is a relation of the definition to the essay question? Or can i just write out the definition without any relation to the question?

why both have same mass?

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Added on October 29, 2008, 7:39 pmmgh=1/2 mv^2...find the velocity before hit the ground..the p=mv lo

This post has been edited by vick5821: Oct 29 2008, 07:39 PM

of course la....even u chg to vapour,still the same mass lo....

oh..so we assume all the liquid change to vapour la?? just the volume not same?

let say i convert water to gas,then back to water...mass same rite?(assume no gas escape)

Volume sure not same mah....liquid molecule is much closer compare to gas...

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Added on October 29, 2008, 8:27 pmhttp://www.andrewchoo.com.my/component/option,com_frontpage/Itemid,1/


Anybody believe???

This post has been edited by sasaug: Oct 29 2008, 08:27 PM

so gas volume will be larger?

yep..on the same substance that u are talking about.....

so volume of solid is smallest.then liquid moderate and gas laregest..just an exception for ice?? the volume of ice is larger then liquid

lolz.....u make me confuse now...ice will expand around 4 degree celcius if i am not mistaken......i oso blur blur...better checkout with others...

ice is an exception..the density of ice is smaller than water..so it float..density smaller, volume bigger

p=m/v
m/v = density

Now i know...

the volume is inversly propotional to density de

another question.

When a horizontal force is applied on a 3kg wooden block, the block moves at a uniform velocity. If the force is increased up to 18N, what is the (new) acceleration of the block?

u sure ur ques?