Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Vin:
OK GUYS IMMA SLEEP NOW !! Its 4 am here !!.. n i need some sleep ..sorry guys if u r questions are pending :(
BEST OF LUCK TO ALL !! :D
Ivo:
--- Quote from: pglasg74 on May 25, 2010, 11:34:04 pm ---no the answer says which diagram shows the waves in the DEEPER region..
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Excactly, the words in the question say they travel quickly in deeper water, so speed of waves are quicker, wavelength increases, as explained with the formula before.
pglasg74:
--- Quote from: ~VIN1094~ on May 25, 2010, 11:30:16 pm ---
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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yeah i got that.. how about this one?
The current in a lamp at full brightness is 0.25 A. The flexible cable to the lamp is designed for currents upto 5 A so it can safely carry teh 0.25 taken by the lamp. Which fuse should be inserted in the plug at the other end of the cable?
.. teh answer is 1
Syed Kazim:
--- Quote from: pglasg74 on May 25, 2010, 11:25:53 pm ---
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..
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Water waves have a shorter wave-length in shallow water, i.e. they travel more slowly.
Water waves have a longer wave-length in deep water, i.e. they travel fast.
Ivo:
--- Quote from: pglasg74 on May 25, 2010, 11:34:28 pm ---thanks, now can u answer "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?
and pls explain how to select the best fuse..
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3A, cos hairdryer only needs 2A. In general, take the max current needed by appliance, then select the fuse with rating of the next one up. So 4A, would need 5A fuse, for example. Using 13A fuse for this would be dangerous, cos of the larger current.
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