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ALL PHYSICS DOUBTS - POST HERE !!
mysteryman:
--- Quote from: 123456789 on May 25, 2010, 11:04:59 pm ---winter 05 ques 31 ppr1 physics helpppppppp may Allah help u in return
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remember that current always takes the path of least resistance
when S is open, all the current has to go through the resistor since there is no other path
but when its closed, most of the current will go towards S since it has less resistance
so more current will go through the lamp therefore increasing brightness
Vin:
--- Quote from: mysteryman on May 25, 2010, 10:54:20 pm ---in those questions about the compass, where shouldnt the needle point?
and in those questions about the 4 blocks and the temperature changes are given then they ask which one has the greatest thermal capacity. what should i write?
like in: http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_1.pdf
question 16
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in those questions about the compass, where shouldnt the needle point?
https://studentforums.biz/index.php/topic,6468.msg225169.html#msg225169
https://studentforums.biz/index.php/topic,6468.msg225177.html#msg225177
and in those questions about the 4 blocks and the temperature changes are given then they ask which one has the greatest thermal capacity. what should i write?
The one having the greatest mass has the greatest thermal capacity
Q 16)
at 0*C both are solid
at 50*C both are liquid
at 100*C and 150*C Benzene is gas
so B
Vin:
--- Quote from: pglasg74 on May 25, 2010, 11:03:21 pm ---OI THE ANSWER IS 144 AND 93, NT 145 N 93... I CHECKEDDD
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yea right ... .. ... .. lemme check on google
Syed Kazim:
--- Quote from: 123456789 on May 25, 2010, 11:04:59 pm ---winter 05 ques 31 ppr1 physics helpppppppp may Allah help u in return
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Question 31 the answer is A. It becomes brighter because when the switch is closed then there is another path for the current to pass through instead of the one which has the resistor.
Question 32 the answer is C. Because the voltage in a parallel circuit is the same for all components connected in parallel across the source.
mysteryman:
--- Quote from: 123456789 on May 25, 2010, 11:08:46 pm ---and ques 32 also plzzzz
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Answer A is incorrect because the current doesnt have to be the same in every circuit
B is wrong because that is a property of a series connection where all the lamps are switched on and off together
C is correct because the voltage across each lamp has to be the same as the mains voltage
D isnt right because that is another property of a series connection where one lamp can destroy the circuit
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