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Physics, Chemistry and Biology: Post your doubts here!

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PHYSICS:
The shock wave from the earthquake travels at 2.5 × 10
3
m / s.
The centre of the earthquake is 6.0 × 10
5
m from the coast of a country.
Calculate how much warning of the arrival of the tsunami at the coast is given by the
earth tremor felt at the coast.

CAN ANYONE PLEASE TELL ME HOW TO SOLVE THIS QUESTION ....IT WAS 4 MARKS???
 
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can anybody please tell me ,that in a transformer,v tend to decrease the resistance and current,to avoid power loses,but wont the decreasing of resistance ,increae the current??:confused:
 
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b)i) 4 minutes (because this is when the difference between sight/sound is smallest)
ii)Because the difference between hearing/seeing was never 0 seconds (because the scientists aren't dead is unfortunately not a correct answer. D:)
iii) Speed = Distance/Time = 1200/3.6=333.33m/s
iv) The assumption is that light reaches the scientists instantaneously
Meh sry i meant question 11 b lol question 7 is simple
 
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OPS I mean question 11 b lol sorry.

So when u have a longer coil, the current is more and when there is a shorter coil as there is less resistance, the current is lesser. V = A*R so 1.8 = x*y if x is reduced then y should have increased which is resistance as the first coil is longer :)
 
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ANALOGUE IS THE VALUE OF CURRENT OR VOLTAGE WITHIN A CERTAIN RANGE IN A CURCUIT...WHILE DIGITAL IS AN EXACT NUMBER VALUE OF CURRENT AND VOLTAGE IN A CURCUIT....
 
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So when u have a longer coil, the current is more and when there is a shorter coil as there is less resistance, the current is lesser. V = A*R so 1.8 = x*y if x is reduced then y should have increased which is resistance as the first coil is longer :)
WRONG lol, he wants a ratio check the answer
 
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can anybody please tell me ,that in a transformer,v tend to decrease the resistance and current,to avoid power loses,but wont the decreasing of resistance ,increae the current??:confused:
plxxxxxxxxx
 
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