Physics: Post your doubts here!

[DeViL gURl B)]

H

meko ni ata a part, sikhado...

okhay .. Aik min

 

[DeViL gURl B)]

meko ni ata a part, sikhado...

A part is that we just use the graph to find the corresponding value of the temp given ..
As in they've given us 22.5 so the corresponding value is 1600 ohm
The reading in the voltmeter could be found by .. First finding the current un the circuit, that is 9/2000 then btw u got 2000 by adding the resistances present in the circuit ...
Now u'll get your current as 4.5*10^-3 .. Since u gotta find the voltage .. Multiply the current with the resistances of the resistors inside the A B loop ... That will give u 800
And the final answer would be 3.6 ..
Hope I helped

 

[Zepudee]

How do we calculate resultant intensity
After subtracting 2 amplitudes then what?

Which paper issit?

 

[Asad Moosvi]

Can someone please explain Q5 part b to me from the following paper? http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_23.pdf

 

[DeViL gURl B)]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_22.pdf

Question 6 anyone? Please

Please ??

 

[DeViL gURl B)]

Aoa,
Guys anyone please have some tips for solving physics paper 2?
Cuz I just can't finish the papers on time ...
Pulse share
Thank u

 

[Suchal Riaz]

Well, after this step why do we multiply by 0.62 m .

that change is for every 1 meter.
4.2mm/m (4.2 mm per one meter)
for 0.62 meters the change will be 0.62 meter *4.2mm/meter = 2.6 mm

 

[Asad Moosvi]

I don't understand q 7 (b) (ii) from http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_23.pdf

Someone please explain it? Aren't the masses equal on both sides?

 

[Asad Moosvi]

Last part of question 7 from http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_23.pdf


Someone please explain it to me!!! I don't understand it!

 

[Zepudee]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_qp_23.pdf

Q6(c)(iv) can someone draw me the 0.2m of the graph? I just want to check whether i drew it correctly

 

[Asad Moosvi]

Can you u

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_23.pdf

Q6(c)(iv) can someone draw me the 0.2m of the graph? I just want to check whether i drew it correctly

Can you help me with the question I posted?

 

[Zepudee]

Please ??

which part?

 

[Asad Moosvi]

COME ON GUYS PLEASE HELPPPPPPP. Q 7 LAST PART FROM http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_23.pdf

PLEASE PLEASE PLEASE

 

[kitkat <3 :P]

COME ON GUYS PLEASE HELPPPPPPP. Q 7 LAST PART FROM http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_23.pdf

PLEASE PLEASE PLEASE

for Y=92 -57
for Z =235- 148 - 3 cux 3 neutrons are there

well not sure about the ii) part
when a reaction occurs then energy is realease and due to release of energy mass can be lost too so thats y the mass is nt equal :/

 

[robinhoodmustafa]

I don't understand q 7 (b) (ii) from http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_23.pdf

Someone please explain it? Aren't the masses equal on both sides?

Some Mass lost in the form of Ek

 

[Asad Moosvi]

for Y=92 -57
for Z =235- 148 - 3 cux 3 neutrons are there

well not sure about the ii) part
when a reaction occurs then energy is realease and due to release of energy mass can be lost too so thats y the mass is nt equal :/

But the mass is 236 on both sides. I'm so confused.

 

[Asad Moosvi]

Some Mass lost in the form of Ek

But if you compare the masses on both sides, they seem to be equal. They're both 236 on both sides

 

[_Ahmad]

COME ON GUYS PLEASE HELPPPPPPP. Q 7 LAST PART FROM http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_23.pdf

PLEASE PLEASE PLEASE

We can answer this by thinking about the energy which is carried away by the particles (alpha or beta) and electromagnetic radiation (gamma) produced in the decay.Albert Einstein realised that we can think of energy as having mass. So if the mass of the nucleus decreases we must look around and find the energy which is carrying away this mass.The greater the apparent loss in mass the greater the amount of energy which is escaping.
To sum up we talk about "mass-energy" . In any closed system the total amount of mass-energy is conserved. If the mass goes down energy goes up and vice versa, but the total is constant

 

[kitkat <3 :P]

But the mass is 236 on both sides. I'm so confused.

they are not talking about the number of neutrons right ??

 

[Asad Moosvi]

We can answer this by thinking about the energy which is carried away by the particles (alpha or beta) and electromagnetic radiation (gamma) produced in the decay.Albert Einstein realised that we can think of energy as having mass. So if the mass of the nucleus decreases we must look around and find the energy which is carrying away this mass.The greater the apparent loss in mass the greater the amount of energy which is escaping.
To sum up we talk about "mass-energy" . In any closed system the total amount of mass-energy is conserved. If the mass goes down energy goes up and vice versa, but the total is constant

You are quoting this from the physics as level course book. I don't understand why the question is saying the sum of the masses is not equal when if you compare both sides, the masses seem to be equal to me.