Qualification > Sciences

physics help !!

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nid404:

--- Quote from: esso on June 09, 2009, 06:20:28 am ---
--- Quote from: nid404 on June 09, 2009, 05:54:49 am ---34  D (transformer..magnetic field to be created )
38  D( 16-8-4, two half lives..so 12000)
31  A(a 1A fuse will be the first to melt and break the circuit..the values of the circuit breaker and the other fuse is higher and switch can be possible only if it is switched off)




--- End quote ---

Thanks for d help ... bt wat abt 35

--- End quote ---

sorry i didn't see 35...it is A because more current flows through the circuit

esso:
but why is 35  A ???
since the resistance decreases .....
the voltage decreases....
 as a result less voltage reaches the motor and rotates slower.....

i think its C....

do any one have the ms????????

emi:
can i know why or how did u know 38 was D ?

nid404:

--- Quote from: esso on June 09, 2009, 06:45:07 am ---but why is 35  A ???
since the resistance decreases .....
the voltage decreases....
 as a result less voltage reaches the motor and rotates slower.....

i think its C....

do any one have the ms????????

--- End quote ---

It's D because when the current increases the coil in the motor rotates faster(it's a motor when u increase the current the field lines are cut faster)

nid404:

--- Quote from: emi on June 09, 2009, 07:01:55 am ---can i know why or how did u know 38 was D ?

--- End quote ---

when the organism died the count rate was 16
when they found the fossil it gave four counts only. The half life is 6000...from 16 to 8 is 1 and from 8 to4 is the second. So 2 half lives are 12000 years. The fossil is 12000 years old

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