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Physics, Chemistry and Biology: Post your doubts here!

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Hi again Anon.....Ive been seein u around lately....
Now cn u also solve this problem for me pls????? ^-^
A uniform metre ruleof weight 0.9N is suspended horizontally by 2 vertical loops of thread A and B placed at 20cm and 30cm from its ends respectively. Find the distances from the centre of the rule at which a 2N weight must be suspended:
i) to make loop A become slack
ii) to make loop B become slack
Hi every one here. Please any one can help for this question?
 
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A plastic cube, of density p , is compressed so that each of its sides becomes one-half of its original length. What is the new density of the material of the cube? A 0.125p B 0.50p C 2.0p D 8.0p
answer is D, please explain how
 
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A plastic cube, of density p , is compressed so that each of its sides becomes one-half of its original length. What is the new density of the material of the cube? A 0.125p B 0.50p C 2.0p D 8.0p
answer is D, please explain how
Take a cube of 1/2 and the answer would be 1/8. So if the volume reduce to 1/8 then the density increases to 8. (Density= mass/volume)
 
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Need these Coursebooks/Textbooks in PDF.
Physics for Cambridge IGCSE Coursebook 4th Edition (Textbook) By David Sang
Chemistry
for Cambridge IGCSE Coursebook 5th Edition (Textbook) By Richard Hardwood & Ian Lodge
Biology
for Cambridge IGCSE Coursebook 4th Edition (Textbook) By Mary Jones & Geoff Jones
 
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in crystallisation you heat the solution then cool it down quickly ,this makes the molecules of the salt bind some water molecules around them forming crystals
in evaporation ,u remove all the water , so the salt is like a powder .also if you heated a crystallised salt ,you'll remove the water of crystallisation and it turns to powder.
yes, both are ways of extracting substances from solutions ,but evaporation can be done when the substance don't dissolve in the solution ,but for crystallisation to occur the substance has to dissolve in the solvent
Hallo can you please kindly send me this book in pdf form

Cambridge IGCSE & O Level Biology: Exam Success​

 
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Good evening everyone
Please need help in getting any good textbook for IB chemistry @ secondary school and Higher level
 
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