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Author Topic: physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!  (Read 717 times)

Offline halosh92

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physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!
« on: December 02, 2009, 04:21:52 pm »
HEY
i have a doubt in physics CIE ASlevel
OCT/NOV 2008
QP 2
Q 7b  2nd part.
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline astarmathsandphysics

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Re: physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!
« Reply #1 on: December 02, 2009, 06:40:37 pm »
In 3 hours
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Offline astarmathsandphysics

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Re: physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!
« Reply #2 on: December 02, 2009, 10:23:01 pm »
voltage across 5000 ohm resistor is 6-3.6=2.4V
resistance of 5000 ohm resistor -thermistor combination =2.4/3.6*2000=4000/3 ohms
1/R=1/R1+1/R2
3/4000=1/5000+1/R2
1/R2=3/4000-1/5000=11/20000
r2=20000/11 ohms
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Offline halosh92

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Re: physics doubt!!!!!!!!!!!!!!!!!!!!!!!!!
« Reply #3 on: December 03, 2009, 07:29:30 am »
Quote from: astarmathsandphysics on December 02, 2009, 10:23:01 pm
voltage across 5000 ohm resistor is 6-3.6=2.4V
resistance of 5000 ohm resistor -thermistor combination =2.4/3.6*2000=4000/3 ohms
1/R=1/R1+1/R2
3/4000=1/5000+1/R2
1/R2=3/4000-1/5000=11/20000
r2=20000/11 ohms

 thankx alot!!!
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everyday we wake up is a miracle, then how do we say miracles dont happen?????
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