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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 199436 times)

Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1665 on: May 26, 2010, 05:24:14 am »
Nevermind my question, off to do the exam, wish me luck!
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1666 on: May 26, 2010, 07:07:27 am »
Quote from: weaam on May 26, 2010, 05:17:48 am
Im having trouble understanding Q13 in O/N 07, could you plz explain, i dunt get why the lvl rises but the pressure stays the same

ok i know you are off to give the exam but .. for ur knowledge

when the atmospheric pressure increases the level rises .. look for the attachment ..

Pressure at P remains the same because P is a vacuum which is nor affected by pressure ..
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Offline red_911

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1667 on: May 26, 2010, 08:08:46 am »
why is question 21 0625/01/M/J/06 B ?  ??? ??? :-X
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1668 on: May 26, 2010, 08:11:50 am »
Quote from: red_911 on May 26, 2010, 08:08:46 am
why is question 21 0625/01/M/J/06 B ?  ??? ??? :-X

Speed = Frequency * Wavelength

Speed decreases, frequency is constant, thus, wavelength decreases (distance between the lines)

it doesnt refract, water waves...travels straight..
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1669 on: May 26, 2010, 08:15:41 am »
Quote from: A@di on May 26, 2010, 08:11:50 am
Speed = Frequency * Wavelength

Speed decreases, frequency is constant, thus, wavelength decreases (distance between the lines)

it doesnt refract, water waves...travels straight..

yestterday you told me

H= I^2 X R

what is the constant? here?

and does this forumula work for wires ..like decrease the resistance decrease heat loss?
                                work for transformers ..like increasign voltage decreases heat loss?
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1670 on: May 26, 2010, 08:19:17 am »
Quote from: Kimo Jesus on May 26, 2010, 08:15:41 am
yestterday you told me

H= I^2 X R

what is the constant? here?

and does this forumula work for wires ..like decrease the resistance decrease heat loss?
                                work for transformers ..like increasign voltage decreases heat loss?

ok this is basically used for transmission of power in overhead cables..

P = V*I

The power is high, thus to decrease current, u have to increase the voltage(so that the power stays the same)

thus high voltage reduces current...and reduced current means reduced heat loss, or electrical energy transferred..

H = I2R

Resistant of wire constant
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1671 on: May 26, 2010, 08:23:04 am »
Quote from: A@di on May 26, 2010, 08:19:17 am
ok this is basically used for transmission of power in overhead cables..

P = V*I

The power is high, thus to decrease current, u have to increase the voltage(so that the power stays the same)

thus high voltage reduces current...and reduced current means reduced heat loss, or electrical energy transferred..

H = I2R

Resistant of wire constant

ooh i see cheers i get now

+ rep ;)
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Offline princess12

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1672 on: May 26, 2010, 08:31:44 am »
did any 1 finish physics paper 1
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Offline haris94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1673 on: May 26, 2010, 08:35:20 am »
yup.......just came back
mine was good
wbu?
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Offline princess12

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1674 on: May 26, 2010, 08:36:17 am »
i have not registered for physics
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Offline DANDUNAH

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1675 on: May 26, 2010, 08:37:07 am »
can someone explain thermal capacity briefly?
thanks in advance
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Offline haris94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1676 on: May 26, 2010, 08:39:54 am »
Quote from: princess12 on May 26, 2010, 08:36:17 am
i have not registered for physics


oh i c
when is your next exam?
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1677 on: May 26, 2010, 08:41:30 am »
It is the amount of energy need to change the state of a subtance ( i.e from liquid to gas -latent heat of vaporisation ) ( from solid to liquid -latent heat of FUSION )

specific latent heat is the amount of energy needed to change state of 1kg of substance

forumal S.T.H = E/m  

Energy over mass


anythin else
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NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline princess12

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1678 on: May 26, 2010, 08:42:16 am »
CHEMISTRY PAPER 3  ON 7 JUNE 2010
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1679 on: May 26, 2010, 08:42:58 am »
Quote from: princess12 on May 26, 2010, 08:42:16 am
CHEMISTRY PAPER 3  ON 7 JUNE 2010

lol i suppose then u startd ur summer holidays :P
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NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa
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