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Offline Got Tech? GO TECH

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Physics paper 1 doubt
« on: May 25, 2010, 12:25:18 pm »
I'm doing summer 2000, and I came across question 13. Can you please explain the solution? Thanks!
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holtadit

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Re: Physics paper 1 doubt
« Reply #1 on: May 25, 2010, 12:26:18 pm »
Please take a screen shot of the question.

I dont have the paper :)
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Offline Got Tech? GO TECH

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Re: Physics paper 1 doubt
« Reply #2 on: May 25, 2010, 12:29:35 pm »
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holtadit

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Re: Physics paper 1 doubt
« Reply #3 on: May 25, 2010, 12:34:52 pm »
hang on
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holtadit

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Re: Physics paper 1 doubt
« Reply #4 on: May 25, 2010, 12:37:15 pm »
It would be D.

The dam wall needs to be thicker at the bottom. WHY U ask ?

Because pressure INCREASES with depth thus the pressure UNDERWATER is larger than at the surface.

So thicker wall at the bottom to resist the pressure.

GOT IT ?   ;)
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Offline Got Tech? GO TECH

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Re: Physics paper 1 doubt
« Reply #5 on: May 25, 2010, 12:38:43 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 12:37:15 pm
It would be D.

The dam wall needs to be thicker at the bottom. WHY U ask ?

Because pressure INCREASES with depth thus the pressure UNDERWATER is larger than at the surface.

So thicker wall at the bottom to resist the pressure.

GOT IT ?   ;)

Ahh, I see, Thanks a lot!!!
+1 for the quick answer :D
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holtadit

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Re: Physics paper 1 doubt
« Reply #6 on: May 25, 2010, 12:40:46 pm »
No problem ;)
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Offline Weaam

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Re: Physics paper 1 doubt
« Reply #7 on: May 25, 2010, 02:45:41 pm »
Ive a question, its question37 and 19 in oct/nov 08, and i cant understand them.
Could anyone help me? :-\
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Offline dsiddiqi11

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Re: Physics paper 1 doubt
« Reply #8 on: May 25, 2010, 03:07:04 pm »
Quote from: weaam on May 25, 2010, 02:45:41 pm
Ive a question, its question37 and 19 in oct/nov 08, and i cant understand them.
Could anyone help me? :-\

 
37.this is a property of a thermistor:AS TEMP ACROSS THERMISTOR INCREASES THE RESISTANCE DECREASES. so in the question, it says, temp across thermistor increases, so resistance decreases, and when resistance decreases, more current can flow towards the lamp (current and resistance are inversely proportional) , and therefore it gets brighter. ANSWER IS C.

19.hot air always rises and cold air moves down, so the gap is down, so from the heater the hot air goes up and cold air goes down.

   GET IT!!!! ;)
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Offline Snake

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Re: Physics paper 1 doubt
« Reply #9 on: May 25, 2010, 03:14:03 pm »
Quote from: weaam on May 25, 2010, 02:45:41 pm
Ive a question, its question37 and 19 in oct/nov 08, and i cant understand them.
Could anyone help me? :-\

Q37=C: This is because the Thermistor gets heated, so Voltage decreases and remember R=V/I, if V decreases then R decreases allowing a stronger current hence brighter lamp!
Q19=B: This is to do with Convection Currents, remember Hot rises, Cold sinks. When the heater heats the hot air rises above the cupboard while the cold air would normally have to go under the cupboard and towards the heater. See the attached picture!

Hope I helped :)
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Offline Weaam

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Re: Physics paper 1 doubt
« Reply #10 on: May 25, 2010, 03:40:30 pm »
Thanks you guys, i get it now, and thanks snake for the picture, that really helped me understand, ill +1 u guys.
Thanks again  ;)
Also from the same year could you please explain Q12 please, sorry for the trouble  :-\
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Offline J.Darren

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Re: Physics paper 1 doubt
« Reply #11 on: May 25, 2010, 03:50:15 pm »
Quote from: weaam on May 25, 2010, 03:40:30 pm
Thanks you guys, i get it now, and thanks snake for the picture, that really helped me understand, ill +1 u guys.
Thanks again  ;)
Also from the same year could you please explain Q12 please, sorry for the trouble  :-\
Atmospheric pressure in the case of a barometer is when the reading of the mercury height on the tube reads 760 mm. Inside the tube the atmospheric pressure at the reservoir supports the arrangement, thus sustaining P at the 760 mm point. It essentially pushes up the mercury to that height. Hence the pressure at the reservoir would be the heaviest, whereas the pressure at the top would be the lowest.
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Offline Weaam

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Re: Physics paper 1 doubt
« Reply #12 on: May 25, 2010, 03:59:26 pm »
Quote from: J.Darren on May 25, 2010, 03:50:15 pm
Atmospheric pressure in the case of a barometer is when the reading of the mercury height on the tube reads 760 mm. Inside the tube the atmospheric pressure at the reservoir supports the arrangement, thus sustaining P at the 760 mm point. It essentially pushes up the mercury to that height. Hence the pressure at the reservoir would be the heaviest, whereas the pressure at the top would be the lowest.
Im sorry, I dont get it, simpler explanation please, like REALLY simple. thanks
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- The man who smiles when things go wrong has thought of someone to blame it on. - Robert Bloch.
-I saw weird stuff in that place last night. Weird, strange, sick, twisted, eerie, godless, evil stuff... and I went in. - Homer
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holtadit

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Re: Physics paper 1 doubt
« Reply #13 on: May 25, 2010, 04:06:14 pm »
Quote from: weaam on May 25, 2010, 03:59:26 pm
Im sorry, I dont get it, simpler explanation please, like REALLY simple. thanks

Which year ?
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holtadit

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Re: Physics paper 1 doubt
« Reply #14 on: May 25, 2010, 04:10:48 pm »
Check the picture.
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