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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 197557 times)

Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1020 on: May 23, 2010, 01:48:34 pm »
http://www.freeexampapers.us/IGCSE/Physics/CIE/2002%20Jun/0625_s02_qp_3.pdf

Q2: Part c - ii (c - i is 1.5 m/s)

Q7: a i knw the answer but dnt knw how to write..

Thx
« Last Edit: May 23, 2010, 01:57:45 pm by ang3l »
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1021 on: May 23, 2010, 01:55:43 pm »
Quote from: ang3l on May 23, 2010, 01:48:34 pm
http://www.freeexampapers.us/IGCSE/Physics/CIE/2002%20Jun/0625_s02_qp_2.pdf

Q2: Part c - ii (c - i is 1.

5 m/s)

Q7: a i knw the answer but dnt knw how to write..

Thx

HIGH  VOLTAGE = LESS CURRENT

less current = less loss of energy !!!

u could also say with high voltage we dont need to buy thick wires to reduce current

q 2 there isnt C?
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1022 on: May 23, 2010, 01:57:21 pm »
Quote from: Kimo Jesus on May 23, 2010, 01:55:43 pm
HIGH  VOLTAGE = LESS CURRENT

less current = less loss of energy !!!

u could also say with high voltage we dont need to buy thick wires to reduce current

q 2 there isnt C?

Oopss..! Sorry wrong link for ppr I wanted answers for ppr 3

http://www.freeexampapers.us/IGCSE/Physics/CIE/2002%20Jun/0625_s02_qp_3.pdf
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1023 on: May 23, 2010, 02:01:38 pm »
Quote from: ang3l on May 23, 2010, 01:57:21 pm
Oopss..! Sorry wrong link for ppr I wanted answers for ppr 3

http://www.freeexampapers.us/IGCSE/Physics/CIE/2002%20Jun/0625_s02_qp_3.pdf

What are you stuck on?  I've done this paper before :D
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1024 on: May 23, 2010, 02:02:45 pm »
Quote from: ang3l on May 23, 2010, 01:57:21 pm
Oopss..! Sorry wrong link for ppr I wanted answers for ppr 3

http://www.freeexampapers.us/IGCSE/Physics/CIE/2002%20Jun/0625_s02_qp_3.pdf

Q2) c) velocity is a vector quantity .. so add 9.5 m/s to 8 m/s = 17.5 m/s


7a) ok so when one sphere is rubbed, it transfers electrons to other sphere and becomes positive and the other sphere become negative
« Last Edit: May 23, 2010, 02:11:53 pm by ~VIN1094~ »
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1025 on: May 23, 2010, 02:05:05 pm »
well look at the top of the 2 graphs

AT POINT B AND POINT D :/ and subtract

it says whilst the ball is in contact..or maybe u dont uderstand teh graph !


DUE TO RUBBING , 1 SPHERE LOSES ELCTRONS SO THIS SPHERE BECOMES POSOTIVE..THE OTHER SPERHE ACCEPTS THIS ELECTRON AND BECOMES NEGATIVE

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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1026 on: May 23, 2010, 02:06:08 pm »
Quote from: ~VIN1094~ on May 23, 2010, 02:02:45 pm
7a) ok so when one sphere is rubbed, it transfers electrons to other sphere and becomes positive and the other sphere become negative

Electrons are rubbed off one sphere, which become positive (loses electrons).  These electrons are then deposited on other sphere, becomes negative (gains electrons).
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1027 on: May 23, 2010, 02:11:39 pm »
is it

E/T = P/S.L.H

IS E/T RIGHT??I WANA MAKE SURE?
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1028 on: May 23, 2010, 02:12:19 pm »
Quote from: Kimo Jesus on May 23, 2010, 02:11:39 pm
is it

E/T = P/S.L.H

IS E/T RIGHT??I WANA MAKE SURE?

Power = Energy/Time
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Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1029 on: May 23, 2010, 02:40:11 pm »
when do u use   E=IVT   and  E=PxT
for example in m/j 2002 q8e(ii) why do u use E=IVT  and nt E=pxt??
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1030 on: May 23, 2010, 02:42:20 pm »
Quote from: Shooting Star on May 23, 2010, 02:40:11 pm
when do u use   E=IVT   and  E=PxT
for example in m/j 2002 q8e(ii) why do u use E=IVT  and nt E=pxt??

You apply the formulas to each question, and see what they provide and what you need to find out.

In that question, you are given the voltage (12V), the current (2A) and time (30), and you want to find Energy so you apply E=VIT.

Answer, By the way, is 0.72kWh
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1031 on: May 23, 2010, 02:42:52 pm »
Quote from: Shooting Star on May 23, 2010, 02:40:11 pm
when do u use   E=IVT   and  E=PxT
for example in m/j 2002 q8e(ii) why do u use E=IVT  and nt E=pxt??

ITS TEH SAME THING !!

V X I = P ...

SO ITS P XT . insted of V X I  X T

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Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1032 on: May 23, 2010, 02:46:56 pm »
Quote from: Kimo Jesus on May 23, 2010, 02:42:52 pm
ITS TEH SAME THING !!

V X I = P ...

SO ITS P XT . insted of V X I  X T



u sure ur ans is right?
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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1033 on: May 23, 2010, 02:48:14 pm »
Quote from: Shooting Star on May 23, 2010, 02:46:56 pm
u sure ur ans is right?

Hes correct. :)
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1034 on: May 23, 2010, 03:19:45 pm »
How does a thermocouple works?

And how can we use a meter rule and a pivot to calculate mass (100 g)?

thx
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