Physics: Post your doubts here!

[Thought blocker]

Great thanks

 

[kitkat <3 :P]

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.

look what i think is u are mistaking the nucleon number with the mass :/ i can be wrong mass is something different when a particle undergoes a radioactive reaction it loses energy cuz of the radiations involved and thats y mass is lost......i can be wrong though

 

[kitkat <3 :P]

Suchal Riaz

 

[_Ahmad]

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.

neither mass nor energy is conserved separately, but that they could be traded one for the other and only the total "mass-energy" is conserved

 

[Suchal Riaz]

Suchal Riaz

jee?

 

[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

ye swaal btaa den

 

[Suchal Riaz]

Suchal Riaz

we don't talk about mass in radioactive decays because the mass of a particle is different when they are moving as they move at very high speed. we talk about their energies. E=MC² and their kinetic energy. the energy can be in form of mass or in form of kinetic energy. in A level write 'mass-energy' is conserved.
although nucleon number are number of nucleons not the mass. means number of proton+neutrons are conserved.

 

[princeali97]

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

I can explain you the last part i.e (ii) cuz other parts seem easy.
Wave traveling from S to X moves a distance of 5m.(simple pythagoras theorem i.e (4^2+3^2)^0.5
Wave traveling through SPX moves a distance of 7m.
So whats the path difference? 7-5 = 2m
Since for constructive interference path difference is n lamba, there will be maxima formed at X.

 

[kitkat <3 :P]

we don't talk about mass in radioactive decays because the mass of a particle is different when they are moving as they move at very high speed. we talk about their energies. E=MC² and their kinetic energy. the energy can be in form of mass or in form of kinetic energy. in A level write 'mass-energy' is conserved.
although nucleon number are number of nucleons not the mass. means number of proton+neutrons are conserved.

thank u ^_^

 

[princeali97]

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

Asad bhai no need to be confused.Theres a simple concept.In a radioactive decay,both nucleon and proton number are conserved.But the total mass of the particles after decay is less than that before the decay which is because of some loss of energy in the form of electromagnetic radiation.

 

[student1415]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s04_qp_2.pdf

AsSalamoAlaikum
can someone please help me with question number 5 a and b plzz

 

[_Ahmad]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w13_qp_21.pdf

Can any please explain Q5 b

 

[kitkat <3 :P]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w13_qp_21.pdf

Can any please explain Q5 b

look the total time take by the wave is 0.20 and the next wave starts after 0.050 of the first wave started what is when 0.25 of the wave has been formed so the next wavt will start from the point where the quater of the wavelength of first wave is hope u got it:/

 

[kitkat <3 :P]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s04_qp_2.pdf

AsSalamoAlaikum
can someone please help me with question number 5 a and b plzz

look the distance covered in n revolutions =2(pi)nr
workdone = F*s
=F*2(pi)nr

so for torque r is the perpendicular distance
and is the force
T=Fr

pue the formula in Workdone equation
W=2(pi)nT
hope it helped

 

[kitkat <3 :P]

Can some one please help O/N 2010 variant 22
Q6 (b) please? What is the formula and explanation?

please post the link

 

[DeViL gURl B)]

which part?

(B)

 

[Zepudee]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf
PLEASE GUYS HELP ME WITH THIS. Q5(a)!!! Please show some workings!! THANKS A LOT!!!!

 

[sma786]

physics application part communication... The formula
number of decibels = lg(Power out/Power in)

Whats lg here? Is it a constant? What is it's value?

 

[Asad Moosvi]

I can explain you the last part i.e (ii) cuz other parts seem easy.
Wave traveling from S to X moves a distance of 5m.(simple pythagoras theorem i.e (4^2+3^2)^0.5
Wave traveling through SPX moves a distance of 7m.
So whats the path difference? 7-5 = 2m
Since for constructive interference path difference is n lamba, there will be maxima formed at X.

Can you also explain b (i) please?

 

[Zepudee]

(B)

if the voltmeter reading is 4V, then use the formula Vout=V(Total) x RAB/RT
4 is Vout. V total is 9.0 and put your RAB as unknown, RT which consists of RAB and 1.2kohm
Then the total resistance, will be 960 ohm
hehehe understand?