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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 196137 times)

Offline Moonlyte

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1140 on: May 25, 2010, 01:08:54 pm »
Quote from: Navthep on May 25, 2010, 01:04:16 pm
Hey guys, i really need help about thermal capacity of an object.
There is one question, June 2006 : P1 : Q16  , the answer is A but i think its B.
Can anyone explain it to me? I have to do the real IG exam tomorrow! (P1)
Thanksss

thermal capacity means that it takes a lot of energy to increase the temperature by 1 degrees, no matter what the size is. in Q16, all 4 blocks were given the SAME energy, but A increased LEAST, so A is the answer.
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1141 on: May 25, 2010, 01:10:53 pm »
Quote from: ang3l on May 25, 2010, 01:08:14 pm
Can u explain..Wat the high/low thermal capactiy actually means..?
Thx

Water has a high thermal capcity. That means it takes A VERY LARGE AMOUNT of heat to raise its temp by 1 degree centigrade.


LOW thermal capacity means only a small amount of heat is needed to cause a LARGE temp rise.


Got it ? Ask again if you haven't.
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Offline Navthep

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1142 on: May 25, 2010, 01:13:58 pm »
Um, can anyone explain convection currents? I'm somewhat confused :S
Thankss :D

pS - Thanks to all who explained me thermal capacity. Really mean it. :)
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1143 on: May 25, 2010, 01:14:23 pm »
Quote from: ang3l on May 25, 2010, 01:07:09 pm
The answer is A but Why...Arent the electrons in outer orbits?  ???
Thx

An unstable atomic nucleus with an excess of neutrons may undergo ?? decay, where a neutron is converted into a proton
and an electron  


So technically the neutron which is in the nucleus is the source of Beta Radiation ;)
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1144 on: May 25, 2010, 01:15:49 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 01:10:53 pm
Water has a high thermal capcity. That means it takes A VERY LARGE AMOUNT of heat to raise its temp by 1 degree centigrade.


LOW thermal capacity means only a small amount of heat is needed to cause a LARGE temp rise.


Got it ? Ask again if you haven't.
Yeah got it...But one thing...The one with high themal capacity is also the one that cools down quickly right?
thx
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1145 on: May 25, 2010, 01:18:45 pm »
Quote from: ang3l on May 25, 2010, 01:15:49 pm
Yeah got it...But one thing...The one with high themal capacity is also the one that cools down quickly right?
thx

no.

Check my post on the Beta radiation. ABOVE.
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1146 on: May 25, 2010, 01:21:33 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 01:18:45 pm
no.

Check my post on the Beta radiation. ABOVE.
Yeah i checked that thx :D

Ohkay and can u explain..How water act a coolant?
Thx alot
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1147 on: May 25, 2010, 01:24:21 pm »
Quote from: ang3l on May 25, 2010, 01:21:33 pm
Yeah i checked that thx :D

Ohkay and can u explain..How water act a coolant?
Thx alot

Water has a HIGH thermal capacity.

 So it can absorb a LARGE amount of heat with only a SMALL temp rise.

 In adittion it only expands SLIGHTLY. So its a good coolant.
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1148 on: May 25, 2010, 01:25:20 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 01:24:21 pm
Water has a HIGH thermal capacity.

 So it can absorb a LARGE amount of heat with only a SMALL temp rise.

 In adittion it only expands SLIGHTLY. So its a good coolant.

Ohkeyy....! Get it
thx
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1149 on: May 25, 2010, 01:29:03 pm »
Anyone cares to explain to me q 14 o/n 04 p1 ofc .. why is it B i thought it would be A more force per unit are ??
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1150 on: May 25, 2010, 01:29:29 pm »
Quote from: Navthep on May 25, 2010, 01:13:58 pm
Um, can anyone explain convection currents? I'm somewhat confused :S
Thankss :D

pS - Thanks to all who explained me thermal capacity. Really mean it. :)


hot air rises and cold air falls. this is cuz when something is hot, it has more energy to move around hence it moves further apart and become less dense.. so it rises ... and cold air is closer together hence denser.. so it falls... :)
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Offline Moonlyte

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1151 on: May 25, 2010, 01:30:36 pm »
I have problems with the following questions of june 2009:

#30:C
#31:A
#34:C
#37:A

Those are the answers but I dont know why. Please help!

Link for the paper:

http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvUGh5c2ljcy9DSUUvMjAwOSBKdW4vMDYyNV9zMDlfcXBfMS5wZGY=
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Offline Snake

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1152 on: May 25, 2010, 01:34:13 pm »
Ok gimme 5 mins I'll explain
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1153 on: May 25, 2010, 01:36:55 pm »
For # 30 take say 5 for each resistor and remember that in C it is connected in parallel and that u use the equation R=R1*r2 over(divided by)R1+R2
I will check the rest and come back to yew dear :)
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1154 on: May 25, 2010, 01:38:13 pm »
Quote from: 8T on May 25, 2010, 01:29:03 pm
Anyone cares to explain to me q 14 o/n 04 p1 ofc .. why is it B i thought it would be A more force per unit are ??


Only a temperature INCREASE would give the molecules more KINETIC ENRGY and cause GREATER/HARDER  collisions.

BUT the question says the TEMPERATURE WAS CONSTANT.

But the VOLUME DECREASED. So there are more air molecules per unit area and hence more FREQUENT collisions with the walls of the pistons.

This causes a pressure INCREAsE.



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