« previous next »
Pages: 1 ... 12 13 [14] 15 16 ... 160   Go Down

Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 230830 times)

Offline $H00t!N& $t@r

  • SF Geek
  • ****
  • Posts: 323
  • Reputation: 887
  • Gender: Female
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #195 on: May 07, 2010, 07:04:55 pm »
A laboratory determination of the specific latent heat of vaporisation of water uses a 120W heater to keep water boiling at its boiling point. Water is turned into steam at the rate of 0.050 g/s.
Calculate the value of the specific latent heat of vaporisation obtained from this experiment. Show your working.

Logged
"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

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #196 on: May 07, 2010, 07:17:22 pm »
Quote from: Shooting Star on May 07, 2010, 07:04:55 pm
A laboratory determination of the specific latent heat of vaporisation of water uses a 120W heater to keep water boiling at its boiling point. Water is turned into steam at the rate of 0.050 g/s.
Calculate the value of the specific latent heat of vaporisation obtained from this experiment. Show your working.



P= 120 W
Heat (Q)  =  120 J/s

mass = 0.05 g/s

Q = mL

L=  120/0.05
= 2400 J/g

this should be right..:)
Logged

Offline $H00t!N& $t@r

  • SF Geek
  • ****
  • Posts: 323
  • Reputation: 887
  • Gender: Female
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #197 on: May 07, 2010, 07:37:12 pm »
Quote from: ~VIN1094~ on May 07, 2010, 07:17:22 pm
P= 120 W
Heat (Q)  =  120 J/s

mass = 0.05 g/s

Q = mL

L=  120/0.05
= 2400 J/g

this should be right..:)

Thanks this is the answer in d ms. the thing I was confuse with is when they said: Water is turned into steam at a rate of 0.050 g/s. I thought they meant speed. So I ws wondering how to calculate that. But hw is 0.050 g/s the mass?
Logged
"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 Snake

  • SF Immigrant
  • **
  • Posts: 117
  • Reputation: 183
  • Gender: Male
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #198 on: May 07, 2010, 07:50:47 pm »
Guys what was the transformer formula? Np/Ns=Vp/Vs=Ip/Is?
Logged
-Once the game is over,the king and the pawn go back in the same box-

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #199 on: May 07, 2010, 07:52:18 pm »
see the thing here is, as u said they hav given the "mass" as 0.05g per second .. here i didnt literally mean it as 'mass' .. it was jus for ur understanding u kno..:)

but did u get the concept ??
 / sec cancels out in the equation ..  ;)  
Logged

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #200 on: May 07, 2010, 07:56:19 pm »
Quote from: Snake on May 07, 2010, 07:50:47 pm
Guys what was the transformer formula? Np/Ns=Vp/Vs=Ip/Is?

Vs/Vp  =  Ns/Np

to find the number of turns or voltage .. depending on ques ..

Is/Ip  =  Vp/Vs

to find any one if other three are given ..

also theres another  formula ..

Power (loss) = I2R
Logged

Offline $H00t!N& $t@r

  • SF Geek
  • ****
  • Posts: 323
  • Reputation: 887
  • Gender: Female
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #201 on: May 07, 2010, 09:29:44 pm »
Quote from: ~VIN1094~ on May 07, 2010, 07:52:18 pm
see the thing here is, as u said they hav given the "mass" as 0.05g per second .. here i didnt literally mean it as 'mass' .. it was jus for ur understanding u kno..:)

but did u get the concept ??
 / sec cancels out in the equation ..  ;)  

ooooohhhhhh  i see what you mean. Thanks!  ;D ;)
Logged
"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 Baladya

  • meawwwww hao hao >.<
  • SF Geek
  • ****
  • Posts: 554
  • Reputation: 681
  • Gender: Male
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #202 on: May 07, 2010, 10:11:30 pm »
Logged
Looks like i ran out of cool signatures :|

Offline Malak

  • Honorary Member
  • SF Farseer
  • *****
  • Posts: 4454
  • Reputation: 65534
  • A warm smile is the universal language of kindness
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #203 on: May 07, 2010, 10:21:03 pm »
Logged
If you are a man who degrades women then allow me to respectfully remind you that you came from ONE

Reminder to myself: Stop worrying and start working

SF magazine 2012 - Download here

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #204 on: May 07, 2010, 11:07:19 pm »

06 Nov P6 1. c) 7.5 (this one is just estimation .. theres no hard and fast rule or ny formula to determine the answer .. ur answer should obiv. a little less than b) ii)

              3. b) i) is attached ..
                     ii) should be base as less room for any error because safer to take as the pins might be of different sizes or not placed vertically/straight.

03 Nov P6 1 d) for this i had to take help from markscheme because i dont hav a hardcopy ..
                     same estimation part .. V= 32.41  take say 1.41 cm3 as 'missing' part
                     subtract it from V to get ii)
« Last Edit: May 07, 2010, 11:26:03 pm by ~VIN1094~ »
Logged

Offline $H00t!N& $t@r

  • SF Geek
  • ****
  • Posts: 323
  • Reputation: 887
  • Gender: Female
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #205 on: May 08, 2010, 05:55:51 am »
For: http://www.freeexampapers.us/IGCSE/Physics/CIE/2003%20Nov/0625_w03_qp_6.pdf
Q4 a
I know its a kiddy question but for some reason i dont understand what scale to use for the x-axis. If I use 0.5 a/(m/s^2) = 2 units it gets hard to plot the points
Logged
"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 Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #206 on: May 08, 2010, 06:30:17 am »
y-axis : 5 units = 0.25

x-axis : 5 units = 0.25
« Last Edit: May 08, 2010, 06:40:15 am by A@di »
Logged
divine intervention!

Offline $H00t!N& $t@r

  • SF Geek
  • ****
  • Posts: 323
  • Reputation: 887
  • Gender: Female
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #207 on: May 08, 2010, 06:48:21 am »
Quote from: A@di on May 08, 2010, 06:30:17 am
y-axis : 5 units = 0.25

x-axis : 5 units = 0.25

Thanks  :)
Logged
"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

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #208 on: May 08, 2010, 07:17:20 am »
hmmm ..thts smart .. graphs ques always bug mee !! evn in maths i hate graphs .. its no like i dont kno them :P but they r really borin ..

comon more doubts .. bring it on .. im waiting :) .. tired of studyin now .. :) :)
Logged

Offline $H00t!N& $t@r

  • SF Geek
  • ****
  • Posts: 323
  • Reputation: 887
  • Gender: Female
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #209 on: May 08, 2010, 09:00:10 am »
Sorry, I have another question...
 http://www.freeexampapers.us/IGCSE/Physics/CIE/2005%20Nov/0625_w05_qp_6.pdf

question 2a. I always get confused with such questions!!  >:(

Logged
"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
Pages: 1 ... 12 13 [14] 15 16 ... 160   Go Up
« previous next »