Physics, Chemistry and Biology: Post your doubts here!

[xxxt]

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???

 

[justforinformation]

i) 4.0 as the least difference = closest to person....
ii) because there was time difference between lightning and thunder....
iii) 1200/3.6 = 333.3....m/s
iv) 330m/s

OPS I mean question 11 b lol sorry.

 

[EpicLol]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s08_qp_3.pdf

Use the corkscrew rule make a fist and stick your thumb out....the thumb points the flow of current so here its downwards, so thumb points downwards and your fingers givce the direction of magnetic feild so in this case its clockwise....

 

[fatima360]

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??

 

[justforinformation]

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

 

[chaotic]

Explain what is meant by the terms analogue and digital, as applied to electronic circuits.

Found this question in a past paper in physics, I know analogue, but what is digital.

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_32.pdf

 

[sma786]

Do we have to learn the truth tables of the logic gates?? (please say no)

 

[thats_me]

i) 4.0 as the least difference = closest to person....
ii) because there was time difference between lightning and thunder....
iii) 1200/3.6 = 333.3....m/s
iv) 330m/s

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w11_qp_32.pdf 7 ci hw do we knw whether to use speed of light or sound ??? :S

 

[AAnsarii]

sby plz xplain 6(b)
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w11_qp_31.pdf

 

[justforinformation]

Do we have to learn the truth tables of the logic gates?? (please say no)

You dont have to learn it as long as you know the outputs and inputs of each logic gate, but imo truth tables make stuff easier lol

 

[AAnsarii]

Do we have to learn the truth tables of the logic gates?? (please say no)

sorry, but yes, its not that difficult, just apply ur logic...

 

[justforinformation]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s10_qp_31.pdf question 11 b plOx xd.

 

[justforinformation]

^whoever answers that question is a genius.

 

[EpicLol]

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

 

[kainat husain]

Thank you


There is 65 pages

ask thi guy he had posted it will really help u

ThatReallyReallyWeirdDude

 

[xxxt]

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....

 

[justforinformation]

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

 

[fatima360]

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??
plxxxxxxxxx

 

[EpicLol]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s10_qp_31.pdf question 11 b plOx xd.

4 is resistance for first coil
6 is resistance for second coil

so the length of second coil is more....it is 1.5* bigger than the first coil
I think thats the answer but Im not sure....so do check with others

 

[justforinformation]

Any luck with that question? lmao