Biology; Chemistry; Physics: Post your doubts here!

[Abdul Hanan]

Sec B Q.9 xperiment to chk if speed is constant

measure distance covered in the middle part of rope by girl at different positions etc . record time taken to cover the distances.
use formula speed=distance/time
repeat and yes this was explained .........

 

[afrolina]

what was the mass and energy change in the heat question?

 

[Abdul Hanan]

I wrote something related to Centripetal Force. Can't remember

it was accelerating as velocity (not speed) was changing as direction was changing
this is a past paper question and i am sure of the answer.

 

[Awesome12]

.-. i meant 0.504 Kg

Do you remember any values
The energy was 72000 J. What was the temp rise, and other values?

 

[Abdul Hanan]

what was the mass and energy change in the heat question?

mass was 0.504 kg something
energy 11 thousand something

 

[asadalam]

Do you remember any values
The energy was 72000 J. What was the temp rise, and other values?

change was 34 and the shc was 4200

for second change was 54 i think

 

[Ram97]

Do you remember any values
The energy was 72000 J. What was the temp rise, and other values?

For first temp was 94-60
For second 94-40

 

[afrolina]

what was the answer to the mcq relating relay?

 

[asadalam]

what was the answer to the mcq relating relay?

Increase voltage of the cell in which the bell was ....i think it was C

 

[Ram97]

what was the answer to the mcq relating relay?

A

 

[afrolina]

are you sure thats correct? If so, then my answer is correct

 

[afrolina]

"A" OR "C" ?

 

[Abdul Hanan]

Increase voltage of the cell in which the bell was ....i think it was C

you mean increasing voltage of the part of circuit which had the bell?(that part of circuit?)
if so yayyyy!

 

[Awesome12]

"A" OR "C"

C

 

[Abdul Hanan]

an MCQ had the answer "LOUD SPEAKER" am i right?

 

[Ram97]

how is graph for speed with uniform acceleration??? like direct proportion??

 

[asadalam]

you mean increasing voltage of the part of circuit which had the bell?(that part of circuit?)
if so yayyyy!

Yes,all other measures could cause the switch to close faster,but that would have no effect on loudness.

 

[afrolina]

an MCQ had the answer "LOUD SPEAKER" am i right?

yup

 

[Abdul Hanan]

how is graph for speed with uniform acceleration??? like direct proportion??

when did that come ?

 

[Ram97]

when did that come ?

Theory main -_-