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ALL PHYSICS DOUBTS - POST HERE !!
Weaam:
Also can i get the answer to o/n 08 Q5 c(i) second varient!
Thanks!
Ghost Of Highbury:
--- Quote from: weaam on May 26, 2010, 08:37:37 pm ---Also can i get the answer to o/n 08 Q5 c(i) second varient!
Thanks!
--- End quote ---
Please provide the links next time you ask a doubt, thank you :D
ill answer this one..
Malak:
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Q11 part c n onwards..
thx
Vin:
--- Quote from: ang3l on May 26, 2010, 08:23:06 pm ---http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Q11 part c nd so on the rest
thx
--- Quote from: ang3l on May 26, 2010, 08:40:32 pm ---http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Q11 part c n onwards..
thx
--- End quote ---
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11 a) A- NOT gate B- AND
b) dark and cold = low light and low temp
Output of A = High
Output of B = Low
ii) dark and warm = low light and high temp.
Output of A = High
Output of B = High
iii) bright and warm = high light and hig temp.
Output of A = Low
Output of B = Low
c) i) Here the relay can be used to increase the current because the output of B is low .. Relay connects two circuits has its own power supply this supply is given as the output of the relay .. the output of B is enough to magnetize the iron in the relay which closes the contacts and supplies outout current (hope u know the structure of a relay so u'll get what im talking about .. in this question u dont have to answer this much ..)
ii) its b) ii) because its the only B output that is high
iii) In a fridge .. it has a closed environment and this type of circuit works in a compact/dark environment
Ghost Of Highbury:
--- Quote from: A@di on May 26, 2010, 08:38:57 pm ---Please provide the links next time you ask a doubt, thank you :D
ill answer this one..
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3 minuts = 180s
energy = 40*180 = 7200J
change in temp = 5.9
250g = 0.25Kg
E = m*c*t
7200/0.25*5.9 = 4881J/kgK
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