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IGCSE PHYSICS

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@d!_†oX!©:
just to add on nd make it even easier for moon to understand....
see, just remember that to alter the temperature at which the light switches on, u gotta change the resistances as cooldude said...
so there are two resistors in the circuit, nd u can't change the resistance of the thermistor cuz it depends on the temperature only...so to change the voltage at which the transistor switches on, we have to change the resistance of R1....
hope u get it!!!

cooldude:
i didnt knw which varaint u were askin for, neway ur ans---

we knw that (p1*v1)=(p2*v2);

therefore 12000*75=300000*v2
therefore v2=30mm
the distance of the piston from the closed end was=75mm
the distance of the piston from the closed end now is=30mm
therefore the distance it has been moved=75-30-45mm

@d!_†oX!©:
hey for ur second question:
see
P1*V1=P2*V2
P1=1.2*10^5 Pa
V1=Area*75
P2=3*10^5 Pa
V2=length*Area
because u know the area is same
thus put the values in the formula and find out the length
length=30mm
now, because the piston was 75mm from the closed end and is now 30mm from the closed end, thus the distance moved=75mm - 30mm =40mm

@d!_†oX!©:
sorry cooldude...didn't see that u already posted.... ::)

cooldude:

--- Quote from: @d!_†oX!© on November 07, 2009, 06:38:30 pm ---sorry cooldude...didn't see that u already posted.... ::)

--- End quote ---


k np

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