physics help !!

[esso]

need help in the questions in the attachment .....

these r from an old paper....

try it out nd tell me de answers....

Thanks in advance....

[amg]

i think the answer should be D...

[nid404]

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)

[esso]

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)

Thanks for d help ... bt wat abt 35

[esso]

i think the answer should be D...

Thanks for the help u 2 +rep

[nid404]

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)

Thanks for d help ... bt wat abt 35

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]

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??

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]

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

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

[angell]

ok

38 is D

because since it emits 16 particles per min, from 16 - 8 - 4 is 2 half lives

now since 1 half live is 6000, 2 half lives prove its 12000 years old

[angell]

Please post this in the physics help section

and tell my, for the motor question, which year is it from? ill see if i have the markscheme!

[esso]

its from may 1995...can any one find the markscheme??

[astarmathsandphysics]

here

[esso]

Thanks astar....

but why is 35 D ?

need an answer please...