Biology; Chemistry; Physics: Post your doubts here!

[luckywang]

I am asking kay wat dont u understand about it?As in wat is ur question?Maybe I can help

i dont understand the whole sentence... i copy it from the syllabus...

 

[convent2012]

http://www.xtremepapers.com/papers/...onal O Level/Physics (5054)/5054_s09_qp_1.pdf
26, 30, 32 ,39 ????

 

[a.abid]

i dont understand the whole sentence... i copy it from the syllabus...

Take it easy That phrase is not really important.Just remember one thing-the resistance of thermister increases at low temperature and it has low resiastance at high temperature .

 

[A star]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s11_qp_12.pdf
confused between b and c of question 35 plz clarify

they usually donot check for exact wordings you only have to convey ur meaning clearly

 

[luckywang]

Take it easy That phrase is not really important.Just remember one thing-the resistance of thermister increases at low temperature and it has low resiastance at high temperature .

thanks!

 

[luckywang]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s09_qp_1.pdf
26, 30, 32 ,39 ????

26=A
30=B
32=B
39=B?
correct?

 

[A star]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s09_qp_1.pdf
26, 30, 32 ,39 ????

26 is a i thhink and 30 D 32B and 39 B

 

[A star]

26=A
30=B
32=B
39=B?
correct?

wang y do u have to contradict me always?

 

[bogus]

they usually donot check for exact wordings you only have to convey ur meaning clearly

huh?

 

[a.abid]

26-The answer is B as the resistance increases with time and current decreases.
30-B this is because the Earth wire which is connected to the metal case originally is not connected to the right place,hence the case will become live.
32-B cuz I think reversing d.c supply and poles of magnet will affect it.
39-B

 

[luckywang]

wang y do u have to contradict me always?

sorry... next time i dont reply... just watch and learn..

 

[kitecrystal]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s09_qp_1.pdf
26, 30, 32 ,39 ????

in 26,resistance increases as temp. rises so a and b are possible choices.then graph B shows current decreasing which is right as current is inversely propotional to resistance.
in 30,metal case is live because live wire becomes in contact with metal case.
in 32.option B as changes reversing direction of coil rotation are reversing d.c. supply or poles of magnet.
in39,there are 3 half lives so total time\3 =1 minute.

 

[asd]

26-The answer is B as the resistance increases with time and current decreases.
30-B this is because the Earth wire which is connected to the metal case originally is not connected to the right place,hence the case will become live.
32-B cuz I think reversing d.c supply and poles of magnet will affect it.
39-B

in 26,resistance increases as temp. rises so a and b are possible choices.then graph B shows current decreasing which is right as current is inversely propotional to resistance.
in 30,metal case is live because live wire becomes in contact with metal case.
in 32.option B as changes reversing direction of coil rotation are reversing d.c. supply or poles of magnet.
in39,there are 3 half lives so total time\3 =1 minute.

Correct, you both -_-

 

[convent2012]

in 26,resistance increases as temp. rises so a and b are possible choices.then graph B shows current decreasing which is right as current is inversely propotional to resistance.
in 30,metal case is live because live wire becomes in contact with metal case.
in 32.option B as changes reversing direction of coil rotation are reversing d.c. supply or poles of magnet.
in39,there are 3 half lives so total time\3 =1 minute.

thankyou i wish i could hit like button twice

 

[convent2012]

26-The answer is B as the resistance increases with time and current decreases.
30-B this is because the Earth wire which is connected to the metal case originally is not connected to the right place,hence the case will become live.
32-B cuz I think reversing d.c supply and poles of magnet will affect it.
39-B

thanku

 

[a.abid]

thanku

Welcome Best of luck for tomorrow

 

[A star]

26-The answer is B as the resistance increases with time and current decreases.
30-B this is because the Earth wire which is connected to the metal case originally is not connected to the right place,hence the case will become live.
32-B cuz I think reversing d.c supply and poles of magnet will affect it.
39-B

correct.nice job.

 

[kitecrystal]

thankyou i wish i could hit like button twice

hahaha..no prob..

 

[a.abid]

correct.nice job.

Ty

 

[daredevil]

why can birds stand on overhead transmission lines without suffering any harm?
-their bodies are of high resistance?
-good insulator feet
-no potential difference b/w feet
- spaces b/w feathers act as insulators..
which one? shouldnt the reason be that they arent connected to earth so thats why? :s

it is b/c no potential difference b/w the feet. when connected to earth they receive an electric shock b/c of the difference in voltage right/? so in other words we can say that there is no potential difference b/w the feet. hope it helped