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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 228980 times)

Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1035 on: May 23, 2010, 03:40:30 pm »
yuo place 1 junction ( cold ) n pure  metling ice at 0 * C . place the hot one in the hot object. Difrence in temperature creates a current and this current is measure by a galvanometer  calibrated in * C

well

put the ruler on a pivot. and make sure ruler is devided eaclty on half
put the rock on the ruler..close to the pivot !

and then add a knows mass  at diffrnt distances until the ruller balances.

MEASURE THE DISTANCE AND TIMES IT BY THE THE KNOWN MASS

and then divide it by the distance of of rock from pivot and you get the  mass
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Offline 2010

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1036 on: May 23, 2010, 04:01:00 pm »
i need help with o/n 07                 Quest.10(b)
i know the inputs and outputs for both gates but still don't understand how they will be placed...

Its on page 13.....
http://www.freeexampapers.us/IGCSE/Physics/CIE/2007%20Nov/0625_w07_qp_3.pdf
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1037 on: May 23, 2010, 04:07:31 pm »
Quote from: Kimo Jesus on May 23, 2010, 03:40:30 pm
yuo place 1 junction ( cold ) n pure  metling ice at 0 * C . place the hot one in the hot object. Difrence in temperature creates a current and this current is measure by a galvanometer  calibrated in * C

well

put the ruler on a pivot. and make sure ruler is devided eaclty on half
put the rock on the ruler..close to the pivot !

and then add a knows mass  at diffrnt distances until the ruller balances.

MEASURE THE DISTANCE AND TIMES IT BY THE THE KNOWN MASS

and then divide it by the distance of of rock from pivot and you get the  mass

Umm..Kinda confused here...Measure which distance? and thn divide by which distance?
Can u draw this situation?
thx
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1038 on: May 23, 2010, 04:13:19 pm »
Quote from: 2010 on May 23, 2010, 04:01:00 pm
i need help with o/n 07                 Quest.10(b)
i know the inputs and outputs for both gates but still don't understand how they will be placed...

Its on page 13.....
http://www.freeexampapers.us/IGCSE/Physics/CIE/2007%20Nov/0625_w07_qp_3.pdf

attached
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1039 on: May 23, 2010, 04:19:23 pm »
Quote from: ang3l on May 23, 2010, 04:07:31 pm
Umm..Kinda confused here...Measure which distance? and thn divide by which distance?
Can u draw this situation?
thx
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1040 on: May 23, 2010, 04:20:32 pm »
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Offline The Golden Girl =D

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1041 on: May 23, 2010, 04:43:54 pm »
Quote from: Kimo Jesus on May 23, 2010, 04:20:32 pm
PAINT FTW!

By the way what does FTW stand for ?
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Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1042 on: May 23, 2010, 04:47:30 pm »
Quote from: the golden girl on May 23, 2010, 04:43:54 pm
By the way what does FTW stand for ?

For The Win.
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Offline The Golden Girl =D

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1043 on: May 23, 2010, 04:48:45 pm »
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1044 on: May 23, 2010, 10:35:10 pm »
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Offline astarmathsandphysics

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1045 on: May 23, 2010, 10:39:03 pm »
Q8 Part b

Q11 all parts

Thx
q8 when a coil turns inside a magnetic field a current is produced JUST LIKE THAT
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1046 on: May 24, 2010, 02:39:03 pm »
Wats the answer...and why?

Thx
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1047 on: May 24, 2010, 02:41:49 pm »
Quote from: ang3l on May 24, 2010, 02:39:03 pm
Wats the answer...and why?

Thx


A

Small temp rise = large thermal capacity

large temp rise = small thermal capcity.
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1048 on: May 24, 2010, 02:50:24 pm »
just to make it clearer


subtances which take alot of time to heat HAVE HIGHT THERMAL CAPACITY ( water )
"""""""""""""""""""""""""""""""less time to heat HAVE LOW THERMAL CAPACITY ( METALS ) --THERMOCOUPLE.. thats why it can measure fast changing temp ..take very little time to heat up
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Offline Mr.DitD

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1049 on: May 24, 2010, 03:17:21 pm »
Hello everyone!!

If there is only one things i do not understand in the whole school syllabus it's the TRANSISTOR. So can someone please explain the transister in detail and say how it works exactly. If you use a diagram or example it would really help.

In the book I have it only says: If there is a current in the base and collecter then there is a current in emitter. HOWEVER, my teacher says it has nothing to do with current, and if the potential difference between the base and emitter is more than 0.7 then there is a current in collecter.  ??? ??? ???

Please help!!!!!!!
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