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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 203681 times)

Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1005 on: May 23, 2010, 08:53:55 am »
Quote from: jellybeans on May 23, 2010, 08:43:21 am
ummm question.. if the bulb is bigger, doesnt it contain more liquid & take longer for the liquid to expand? then.. how would it be more sensitive?  :-\


http://www.physicsforums.com/showthread.php?t=174853

this will explain evreythng ^

also this 1

If the liquid was only in the capilallary then the volume wouldn't make any difference to the sensitivity. Increase the temperature by 1% would increase volume by 1% and the height in the tube by 1%
But suppose there is a large bulb containing 99% of the mercury and the tube only holds 1%. Now a 1% increase in temperature again gives a 1%increase in volume but this doubles the amount in the tube and so gives a change in the height of 100% not 1%.
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1006 on: May 23, 2010, 08:57:45 am »
i wrot ethe asnwer in the qoute ..sorry


anwyawy basically
! if u havbe 5cm 3 and 100cm3 in diffretn thermometer but both thermometrs have same capillary tube Size


put them both in 100* C

5cm3 will easily expand to teh 100* C but imagin 100cm3 in the same capillary tube tryin to expand !!! it wil expand waaaaaaaay abooooooove  caz there si more liquid to expand !!!!!!

what is  sesitivity !!!

HOW MUCH THE LIQUID EXPANDS FOR EVERY DEGREE RISE IN TEMP
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Offline J.Darren

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1007 on: May 23, 2010, 09:05:52 am »
Quote from: Kimo Jesus on May 23, 2010, 08:57:45 am
i wrot ethe asnwer in the qoute ..sorry


anwyawy basically
! if u havbe 5cm 3 and 100cm3 in diffretn thermometer but both thermometrs have same capillary tube Size


put them both in 100* C

5cm3 will easily expand to teh 100* C but imagin 100cm3 in the same capillary tube tryin to expand !!! it wil expand waaaaaaaay abooooooove  caz there si more liquid to expand !!!!!!

what is  sesitivity !!!

HOW MUCH THE LIQUID EXPANDS FOR EVERY DEGREE RISE IN TEMP
If the bulb is bigger, it would affect the resposivness as mercury / alcohol in the bulb takes longer to reach the room temperature.

The width of the tube affects the sensitivity of the thermometer as different liquids has dirrect expansitivity for the same temperature rise and same volume.
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1008 on: May 23, 2010, 09:41:08 am »
Quote from: J.Darren on May 23, 2010, 09:05:52 am
If the bulb is bigger, it would affect the resposivness as mercury / alcohol in the bulb takes longer to reach the room temperature.

The width of the tube affects the sensitivity of the thermometer as different liquids has dirrect expansitivity for the same temperature rise and same volume.

thats what i thought :/
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1009 on: May 23, 2010, 09:41:48 am »
Quote from: Kimo Jesus on May 23, 2010, 08:57:45 am
i wrot ethe asnwer in the qoute ..sorry


anwyawy basically
! if u havbe 5cm 3 and 100cm3 in diffretn thermometer but both thermometrs have same capillary tube Size


put them both in 100* C

5cm3 will easily expand to teh 100* C but imagin 100cm3 in the same capillary tube tryin to expand !!! it wil expand waaaaaaaay abooooooove  caz there si more liquid to expand !!!!!!

what is  sesitivity !!!

HOW MUCH THE LIQUID EXPANDS FOR EVERY DEGREE RISE IN TEMP

thankyou.  :)
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Offline Adzel

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1010 on: May 23, 2010, 12:10:41 pm »
Check attached please...
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1011 on: May 23, 2010, 12:18:44 pm »
Quote from: Adzel on May 23, 2010, 12:10:41 pm
Check attached please...

For this one u hav to do exactly opposite of u did earlier because the question asks 20 hrs BEFORE the sample was tested ..
so u double the weight of the substance

0.48g to 0.96g = 5hrs .. this means it before 5 hrs the sample was 0.95g

0.96g to  1.92g = 5+5 = 10 hrs

1.92 to 3.84g  = 10+5 hrs = 15hrs

3.84  to 7.86g  = 15 + 5hrs = 20 hrs
« Last Edit: May 23, 2010, 12:20:49 pm by ~VIN1094~ »
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1012 on: May 23, 2010, 12:21:14 pm »
Quote from: Adzel on May 23, 2010, 12:10:41 pm
Check attached please...
the question literally says


after 20 hours  the mass become .48

and it tells you the half life of this ma is 5 hours

  7.68-->3.48-->1.92-->.96-->  .48  (  just go backwards )   X 2

5 hours means 4 half lifes to 20 !  


better explanation from VIN :p
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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1013 on: May 23, 2010, 01:06:46 pm »
how to asnwer?
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1014 on: May 23, 2010, 01:12:03 pm »
Quote from: Kimo Jesus on May 23, 2010, 01:06:46 pm
how to asnwer?

Is the answer 33,333J/s (33,300J/s to 3sf).

Using M=DV and P=E/T
« Last Edit: May 23, 2010, 01:16:41 pm by Ivo »
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1015 on: May 23, 2010, 01:14:57 pm »
Quote from: Ivo on May 23, 2010, 01:12:03 pm
Is the answer 33333J/s

yea i got the same. . 33,333 J/s
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1016 on: May 23, 2010, 01:15:16 pm »
Quote from: Ivo on May 23, 2010, 01:12:03 pm
Is the answer 33333J/s

yeh its right

explain :)
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1017 on: May 23, 2010, 01:17:44 pm »
Quote from: Kimo Jesus on May 23, 2010, 01:15:16 pm
yeh its right

explain :)

I've modified my post.  See earlier for explanation!
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1018 on: May 23, 2010, 01:18:49 pm »
Quote from: Kimo Jesus on May 23, 2010, 01:15:16 pm
yeh its right

explain :)

density = mass/volume

vol = 0.005m * 100m2
     = 0.5cm3

mass = 1000 *0.5
= 500kg

Q = mL
= 500 * 2 * 10^6
= 1 * 10^9 J

rate / sec = 10^9 /  3 * 10 ^4 ses
= 33,333 J/s
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1019 on: May 23, 2010, 01:22:32 pm »
oh ok cheers guys  got it

thanks :D
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