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ALL PHYSICS DOUBTS - POST HERE !!

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Vin:

--- Quote from: 8T on May 25, 2010, 12:13:16 pm ---Isnt the half (1.3 - 0.9 = 0.4)
THen full 2 * 0.4 = 0.8
So 1.3- 0.8 = 0.5  which is B
Hope u got it :)

--- End quote ---

lol .. two diff. methods :P Adzel i think u should stick by this one ;)

8T:
Haha well I wouldnt judge :P
He could do his job choosing Lol
I like urs 2 .. i like dif ways :)

Vin:

haha .. let him choose .. now ppl. are getting choices too :P XD

Adzel By the way which paper is it ?? i never solved this one .. i better do ;)

ambitious94:

--- Quote from: Moonlyte on May 25, 2010, 11:37:47 am ---Could someone please help me with Nov 2009 number 17? The answer is A, but i dont know why.

Here's the link for the paper:
http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvUGh5c2ljcy9DSUUvMjAwOSBOb3YvMDYyNV93MDlfcXBfMS5wZGY=

--- End quote ---
Happened to have just done that paper  ;D
Okay, so let's eliminate the incorrect choices. C and D are IMPOSSIBLE. Why, since we want a CONVECTION current to be set up. so there has a to be a difference in temperatures of the particles, not simply moving them.
So now if we cool it at Y- since it is already at the bottom of the beaker, won't move upwards, so no current, it just stays where it is.
SO now the only plausible solution we have is A, so if we cool the water at X, it'll move downwards due to being denser n here you go- ur very own CONVECTION CURRENT  ;D
Hope I made sense to u

ambitious94:
Now my turn to get help :P
First Question:
A ball is thrown upwards.
What effect does the force of gravity have on the ball?
A It produces a constant acceleration downwards.
B It produces a constant acceleration upwards.
C It produces a decreasing acceleration upwards.
D It produces an increasing acceleration downwards.

Answer's A. How can it accelerate downwards, when it's mocing upwards?  ???
 

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