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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 231004 times)

Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1605 on: May 25, 2010, 10:49:44 pm »
vin im still waiting.... hope u hvnt forgotten me :'(
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Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1606 on: May 25, 2010, 10:50:15 pm »
Quote from: pglasg74 on May 25, 2010, 10:45:19 pm


thxxx 4 ans. mine, can u answer the fuse one as well? and also, can you tell me oct/november 2006 #23 please? CAN SOMEONE TELL ME TEH RELATION BETWEEN FREQUENCY, AMPLITUDE, PITCH AND LOUDNESS PLEASEPLEASEPLEASEPLEASE?

When the frequency increases, the pitch of a sound increases.
When the amplitude increase, a sound becomes louder.
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Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1607 on: May 25, 2010, 10:51:00 pm »
@6394:  kk  :D
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"If A equals success, then the formula is:
A=X+Y+Z, X is work. Y is play. Z is keep your mouth shut"- Albert Einstein

Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1608 on: May 25, 2010, 10:51:47 pm »
Quote from: Shooting Star on May 25, 2010, 10:23:41 pm
m/j 2005 q32. The answer is b. why?? i thought its A. nd can u explain y its nt A...

Quote from: Shooting Star on May 25, 2010, 10:49:44 pm
vin im still waiting.... hope u hvnt forgotten me :'(

OK listen .. A is a variable resistor .. so it can be used to vary the pd/current/resistance .. BUT if u notice it is connected in parallel with the lamp .. the rule states that appliances connected in parallel receive EQUAL pd ..

B is a potentiometer(variable resistor)  here it is used as a rheostat where it has a sliding contact which is used to vary the current and pd ..
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Offline mysteryman

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1609 on: May 25, 2010, 10:54:20 pm »
in those questions about the compass, where shouldnt the needle point?

and in those questions about the 4 blocks and the temperature changes are given then they ask which one has the greatest thermal capacity. what should i write?

like in: http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_1.pdf
question 16
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Offline pglasg74

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1610 on: May 25, 2010, 10:55:22 pm »
Quote from: ~VIN1094~ on May 25, 2010, 10:46:43 pm
remember this ..
In a beta decay a neutron changes to a proton and an electron .. The proton remains in the nucleus and electron is emitted as a beta particle

eg . isotope of carbon .. carbon 14

146C  ---->  714N  +  -1e

in your ques .. 145 neutrons remain the same .. 92 protons INCREASE to 93

that's what i thought but the answer is B not D :S:S
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1611 on: May 25, 2010, 10:56:39 pm »
lol guess wat ppl aftr finishin 09 p1 i was lukin thru ms n aftr checkin more dan half i realizd k i opnd chem ms
 >:( ;D ;D ;D ;D ;D
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Offline pglasg74

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1612 on: May 25, 2010, 10:57:30 pm »
i have a thought, you know how you said a neutron changes to a proton and electron? ok that means the neutron doesn't exist so 145 becomes 144, buuuut since it makes a proton, 92 becomes 93, and the electron isn't a concern.. am i right or too much analysis? By the way how was chem p1?
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1613 on: May 25, 2010, 10:58:22 pm »
Quote from: pglasg74 on May 25, 2010, 10:45:19 pm


thxxx 4 ans. mine, can u answer the fuse one as well? and also, can you tell me oct/november 2006 #23 please? CAN SOMEONE TELL ME TEH RELATION BETWEEN FREQUENCY, AMPLITUDE, PITCH AND LOUDNESS PLEASEPLEASEPLEASEPLEASE?

for the fuse one i have modified the post .. can u post a ques frm a past paper .. it'll be easy to explain ..

 




Amplitude is the height ..
Frequency is the number of oscillations per sec
Pitch depends upon the frequency of the wave .. high-pitched is high frequency but smaller wavelength and Low-pitch is low frequency and greater wavelength
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Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1614 on: May 25, 2010, 10:59:09 pm »
Quote from: ~VIN1094~ on May 25, 2010, 10:51:47 pm


OK listen .. A is a variable resistor .. so it can be used to vary the pd/current/resistance .. BUT if u notice it is connected in parallel with the lamp .. the rule states that appliances connected in parallel receive EQUAL pd ..

B is a potentiometer(variable resistor)  here it is used as a rheostat where it has a sliding contact which is used to vary the current and pd ..
ahhh i see. Thanks again!  ;)
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"If A equals success, then the formula is:
A=X+Y+Z, X is work. Y is play. Z is keep your mouth shut"- Albert Einstein

Offline mysteryman

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1615 on: May 25, 2010, 11:00:21 pm »
someone answer my question please :/
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1616 on: May 25, 2010, 11:01:15 pm »
Quote from: pglasg74 on May 25, 2010, 10:55:22 pm
that's what i thought but the answer is B not D :S:S



Quote from: ~VIN1094~ on May 25, 2010, 10:46:43 pm
remember this ..
In a beta decay a neutron changes to a proton and an electron .. The proton remains in the nucleus and electron is emitted as a beta particle

eg . isotope of carbon .. carbon 14

146C  ---->  714N  +  -1e

in your ques .. 145 neutrons remain the same .. 92 protons INCREASE to 93




got it ??
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Offline pglasg74

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1617 on: May 25, 2010, 11:03:21 pm »
OI THE ANSWER IS 144 AND 93, NT 145 N 93... I CHECKEDDD
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Offline Naruto123

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1618 on: May 25, 2010, 11:04:59 pm »
winter 05 ques 31 ppr1 physics helpppppppp may Allah help u in return
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Offline Naruto123

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1619 on: May 25, 2010, 11:08:46 pm »
and ques 32 also plzzzz
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