ALL PHYSICS DOUBTS - POST HERE !!

[Shazizzzle]

When calculating the pressure in a liquid, using p=hdg, do we add to it the atmospheric pressure of 1.0 X 10⁵ too, to get the total pressure applied on the, say, diver, or is just the answer to p=hdg the final answer to the pressure applied to the diver?

[Adzel]

I don't really understand why we use a relay in circuits. When they ask why a relay is used in a circuit? what's the full answer to that?

Small current swiches on large current....

[The Golden Girl =D]

are you confusing yourself with mechanical waves and light rays ??

VIN , i don't think u got what i meant    but anyways i can manage to understand it  

gd luck in ur french and Physics tomorrw .............gosh i luuuuuuuuuuuuv physics  ....pray for me ,people  

[Weaam]

Rondom Jerky Motion[/cente

Dude, thats part a, i need part b!
but thanks..

[8T]

GUYZ do we have to change da temperature to kelvin or not thx

yes we do.

[Weaam]

Also can i get the answer to o/n 08 Q5 c(i) second varient!
Thanks!

[Ghost Of Highbury]

Also can i get the answer to o/n 08 Q5 c(i) second varient!
Thanks!

Please provide the links next time you ask a doubt, thank you

ill answer this one..

[Malak]

http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf

Q11 part c n onwards..

thx

[Vin]

http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf

Q11 part c nd so on the rest

thx

http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf

Q11 part c n onwards..

thx

11 a) A- NOT gate B- AND

b) dark and cold  = low light and low temp

Output of A = High
Output of B = Low

ii) dark and warm = low light and high temp.

Output of A = High
Output of B = High

iii) bright and warm = high light and hig temp.

Output of A = Low
Output of B = Low

c) i) Here the relay can be used to increase the current because the output of B is low .. Relay connects two circuits has its own power supply this supply is given as the output of the relay .. the output of B is enough to magnetize the iron in the relay which closes the contacts and supplies outout current  (hope u know the structure of a relay so u'll get what im talking about .. in this question u dont have to answer this much ..)

ii) its b) ii) because its the only B output that is high

iii) In a fridge .. it has a closed environment and this type of circuit works in a compact/dark environment

[Ghost Of Highbury]

Please provide the links next time you ask a doubt, thank you

ill answer this one..

3 minuts = 180s

energy = 40*180 = 7200J

change in temp = 5.9
250g = 0.25Kg
E = m*c*t

7200/0.25*5.9 = 4881J/kgK

[Adzel]

http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf

Q11 part c n onwards..

thx

Why don't you check the Mark Scheme  

[Weaam]

Smaller gaps between ice...

Dude, i think u got the wrong question!  

[Shazizzzle]

If you're not a 'Physics Doubt', you don't belong here.

[Ghost Of Highbury]

Dude, i think u got the wrong question!  

Answered

[Adzel]

Dude, i think u got the wrong question!  

Sorry...I got to sleep cant concentrate.