Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
pglasg74:
--- Quote from: ~VIN1094~ on May 25, 2010, 11:22:04 pm ---look at the temperature difference .. only A has a temperature rise of 2 *C .. greatest thermal capacity
others have increased by 8, 4,6 as their thermal capacity is lesser
--- End quote ---
vin can u explain.. i dont understand questions like #20 in summer 07.. like i dont get it, isnt wavelength supposed to decrease when they enter deeper, why are they further apart? why is the answer c not b :S:S:S:S
and i posted the fuse question before..
Syed Kazim:
--- Quote from: Ivo on May 25, 2010, 11:22:53 pm ---Please please can someone answer these questions: S06 - Qs 19 and 20.
--- End quote ---
Question 19: D.
It cannot be A because radiation is not prevented by an air gap.
It cannot be B because heat does pass through the sides of the cup.
It cannot be C because hot air rises and thus it will not go by convection to the bottom.
It has to be D.
High-R:
--- Quote from: 6394 on May 25, 2010, 10:16:21 pm ---lol hamz no 1 noes
acha sun konsa ppr kr rahi hai!!!
--- End quote ---
@6394 lol ya ...finishd all ppr..no more i think ill do
PPL PLZ TELL ME....VIN???
Syed Kazim:
--- Quote from: Syed Kazim on May 25, 2010, 11:27:24 pm ---Question 19: D.
It cannot be A because radiation is not prevented by an air gap.
It cannot be B because heat does pass through the sides of the cup.
It cannot be C because hot air rises and thus it will not go by convection to the bottom.
It has to be D.
--- End quote ---
Question 20: D.
It cannot be A because that is the definition of wave-length.
It cannot be B because that is half a wave-length.
It cannot be C because speed of a water wave is not measured by particles moving up and down rather by wave-front moving along a surface.
It has to be D.
Vin:
--- Quote from: pglasg74 on May 25, 2010, 11:15:23 pm ---
vin ill give u the fuse qn.. here:
"A mains current can safely supply a current of 40 A. A hairdryer takes 2A. It is connected to the circuit by a lead which can safely carry up to 5 A.
Which fuse is best to use in the plug fitted to the hairdryer lead?"
1 A, 3 A, 50 A OR 10 A?
--- End quote ---
ok i think its 3A .. 50 A and 10 A are out of the ques because they will cause the wire to melt as it can carry only 5 A
1 A is used then the dryer will not work because it requires a minimum of 2 A
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