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Physics, Chemistry and Biology: Post your doubts here!

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IsraJ

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Gehad Mohamed said:
Could someone please help me in Q 37 & 15 in http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s08_qp_1.pdf
Click to expand...

For Q15, the temperature doesn't change means that the kinetic energy of the molecules is constant so the speed is constant. Increasing the pressure causes more air particles to be present within the area and so it increases the no. of collisions since the no. of particles are increased.
For Q37, the reading in the voltmeter increases since the voltage of the 100 ohms resistor increases since the other resistor's resistance is reduced and since V=IR, voltage is proportional to resistance and a reduce in resistance reduces voltage.
 
Gehad Mohamed

Gehad Mohamed

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IsraJ said:
For Q15, the temperature doesn't change means that the kinetic energy of the molecules is constant so the speed is constant. Increasing the pressure causes more air particles to be present within the area and so it increases the no. of collisions since the no. of particles are increased.
For Q37, the reading in the voltmeter increases since the voltage of the 100 ohms resistor increases since the other resistor's resistance is reduced and since V=IR, voltage is proportional to resistance and a reduce in resistance reduces voltage.
Click to expand...
Thanks alot :D
 
salma_69

salma_69

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A metal wire, initially 1.000m long, extends by 4mm when a load of 2N is added to it.
What will the length of the wire be if a further 3N is added, assuming it does not extend beyond
its limit of proportionality?

A 1.060m
B 1.080m
C 1.010m
D 1.012m
plz help me in this...
 
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IsraJ

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salma_69 said:
A metal wire, initially 1.000m long, extends by 4mm when a load of 2N is added to it.
What will the length of the wire be if a further 3N is added, assuming it does not extend beyond
its limit of proportionality?

A 1.060m
B 1.080m
C 1.010m
D 1.012m
plz help me in this...
Click to expand...

The answer is C. The Hooke's Law is F=kx
Using the 2N and 4 mm we find k- k=F/x= 2/.004= 500N/m
x for a force of 5N (2N+3N) - x=F/k= 5/500= 0.01m
 
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shazmina

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ManalMansoor said:
Please tell me why is the answer 'B' but not 'A' in this http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Physics%20(0625)/0625_w08_qp_1.pdf

Replay asap :)
Thanks
Click to expand...

in Q3 u will hv to fnd de speed at all 4 stages...dere will b 2 wid de same speed...hope u gt it..:)
in Q29..we knw dat PD is directly propotional to resistance nd dat resistance is inversly prpotional to current....dere fre choose de with low pd but de 1 wid more current...r u cn easily fnd it by calculation using de formula...hope u gt it
 
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Othman

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Gehad Mohamed

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Othman said:
Q2 ) Acceleration from the hit, acceleration from the gravity, and for R it Is accelerating as it was at rest for a moment when it reached the ground.

q12 ) Because in that space above the barometer it is vacuum. Which is about 0 pressure.
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Thanks alot :D
 
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Othman

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Marwa' said:
Im sorrrryyy but I have one more doubt :$,

Same paper, question 34
Click to expand...
Using the right hand grip rule, the current is out of the page so your thumb should be pointing out of the page and the rest of our fingers will show the direction of magnetic field, it is C because the compass is pointing in the right direction.
 
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