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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 229057 times)

Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1110 on: May 25, 2010, 12:16:38 pm »
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 :)

lol .. two diff. methods :P Adzel i think u should stick by this one ;)
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1111 on: May 25, 2010, 12:18:45 pm »
Haha well I wouldnt judge :P
He could do his job choosing Lol
I like urs 2 .. i like dif ways :)
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1112 on: May 25, 2010, 12:22:10 pm »

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 ;)
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1113 on: May 25, 2010, 12:25:51 pm »
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=
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
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1114 on: May 25, 2010, 12:27:53 pm »
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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Offline kashim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1115 on: May 25, 2010, 12:30:04 pm »
Can somebody upload the physics AQA A unit 2 January 2010 paper and mark scheme? I'm really struggling in general and really need as much practice as possible.
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1116 on: May 25, 2010, 12:31:16 pm »
Quote from: ambitious94 on May 25, 2010, 12:27:53 pm
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?  ???
 

read the ques ! What effect does the force of gravity have on the ball? acts always downwards ;) uniformly on a body ..
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1117 on: May 25, 2010, 12:31:56 pm »
Next question:
The object in the diagram is acted upon by the two forces shown.

3N--> object<--2N

What is the effect of these forces?
A The object moves to the left with constant speed.
B The object moves to the left with constant acceleration.
C The object moves to the right with constant speed.
D The object moves to the right with constant acceleration.

Answer's D. Just wanna clarify. A resultant force on an object causes it to accelerate then move in a constant speed, or does it cause it to accelerate constantly? :S HELP HELLPPPP
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1118 on: May 25, 2010, 12:33:06 pm »
Quote from: kashim on May 25, 2010, 12:30:04 pm
Can somebody upload the physics AQA A unit 2 January 2010 paper and mark scheme? I'm really struggling in general and really need as much practice as possible.


HAVE U POSTED IN THE RIGHT BOARD ??



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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1119 on: May 25, 2010, 12:33:40 pm »
Quote from: ~VIN1094~ on May 25, 2010, 12:31:16 pm
read the ques ! What effect does the force of gravity have on the ball? acts always downwards ;) uniformly on a body ..
OOOH YEA...well ain't u genius  ;) :D....THANKSSSSSSSSSS
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1120 on: May 25, 2010, 12:35:47 pm »
Quote from: ambitious94 on May 25, 2010, 12:31:56 pm
Next question:
The object in the diagram is acted upon by the two forces shown.

3N--> object<--2N

What is the effect of these forces?
A The object moves to the left with constant speed.
B The object moves to the left with constant acceleration.
C The object moves to the right with constant speed.
D The object moves to the right with constant acceleration.

Answer's D. Just wanna clarify. A resultant force on an object causes it to accelerate then move in a constant speed, or does it cause it to accelerate constantly? :S HELP HELLPPPP

Accelerate constantly.

F = ma
1N = ma

1N/m = a

m is constant, thus a is constant.
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1121 on: May 25, 2010, 12:36:36 pm »
Quote from: ambitious94 on May 25, 2010, 12:31:56 pm
Next question:
The object in the diagram is acted upon by the two forces shown.

3N--> object<--2N

What is the effect of these forces?
A The object moves to the left with constant speed.
B The object moves to the left with constant acceleration.
C The object moves to the right with constant speed.
D The object moves to the right with constant acceleration.

Answer's D. Just wanna clarify. A resultant force on an object causes it to accelerate then move in a constant speed, or does it cause it to accelerate constantly? :S HELP HELLPPPP

ok .. in this case .. it cannot be CONSTANT SPEED because the force acting on a body will INCREASE the speed UNIFORMLY as the force is being applied the bidy moves with a constant acceleration
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1122 on: May 25, 2010, 12:37:37 pm »
Quote from: kashim on May 25, 2010, 12:30:04 pm
Can somebody upload the physics AQA A unit 2 January 2010 paper and mark scheme? I'm really struggling in general and really need as much practice as possible.

@ Aadi .. what board is kashim talking abt ?? jan 2010 ?!?
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Offline Adzel

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1123 on: May 25, 2010, 12:40:19 pm »
@ 8T and VIN...Thanks alot

By the way its M/J 07
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1124 on: May 25, 2010, 12:40:54 pm »
Quote from: ~VIN1094~ on May 25, 2010, 12:37:37 pm
@ Aadi .. what board is kashim talking abt ?? jan 2010 ?!?

No clue
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