Physics: Post your doubts here!

[Student12]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s05_qp_4.pdf
Question 4 c(i)

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s05_qp_4.pdf
Question c(i)

question?

 

[Student12]

question?

Question 4

 

[A star]

Question 4

its simple use the formulae indicate in b
f=1/2pie(sqr.rt(Apg/M))
f=1/T the time period of one wave
A=pie (r)^2
density is given g is 9.8 so find m

 

[Alazne Diamond]

O/N 2013 41

 

[boxfire1995]

Can anyone please explain to me the emission spectra? Please?

 

[hellangel1]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w13_qp_43.pdf
Q9 bii, how to make the graph?

 

[itallion stallion]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_41.pdf

Question 1 part b please..

Centripetal force =mv*2/r

Gravitational force=GMm/R*2
Gracitational force provides centripetal force.
Put forces equal.find Velocitput velocity in Kinetic energy formula!

 

[itallion stallion]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w13_qp_43.pdf
Q9 bii, how to make the graph?

See page 465.graph drawn there.its posted be 'that's me'

 

[A star]

View attachment 42994
O/N 2013 41

these points
ultrasound waves produced using the crystal
reflected from inside the body
reflection happens at boundry of different structures like bone and muscle
reflection is detected amplified and processed
explain about attenuation
alpha beta scan

 

[Alazne Diamond]

these points
ultrasound waves produced using the crystal
reflected from inside the body
reflection happens at boundry of different structures like bone and muscle
reflection is detected amplified and processed
explain about attenuation
alpha beta scan

thnxx
bt it wud b better if u can write da whole thing..........cuz m confused how to write evrything for 6 marks

 

[A star]

thnxx
bt it wud b better if u can write da whole thing..........cuz m confused how to write evrything for 6 marks

there is a big difference btw principle of production and working . in one you have to explain about how waves are produced and in the other how waves are used in detection

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s03_qp_4.pdf
Question2 .Can someone explain this to me?????????????

i dont get these questions too :/ daredevil Rutzaba

 

[Alazne Diamond]

there is a big difference btw principle of production and working . in one you have to explain about how waves are produced and in the other how waves are used in detection

ooooooooooo ok.............thnxx a lot!!!

 

[hela]

Thing is, the ray is being absorbed twice and is being total internally reflected once.
So first I is being absorbed so we have 0.39I being transmitted to the bone and muscle boundary. 0.33 times 0.39 is then being internally reflected so we have 0.33 x 0.39I. Then again when it is moving from the boundary to the outside, it is again being absrbed so we have 0.39 x 0.33x 0.39 I which is why they squared the 0.39.

Why 0.33 x 0.39I ?

 

[msohailz14]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s03_qp_4.pdf
Question2 .Can someone explain this to me?????????????

First, it's essential that you know the meaning and definition of internal energy.
Internal Energy: Internal Energy of a substance is equal to the sum of the kinetic and potential energies of all of it's particles.
Q2 (a) - When you freeze water, there is obviously no change in it's height and kinetic energy decreases because molecules are being cooled, so there is no increase in internal energy of the body, in fact there is a decrease. Answer is no.
For the second part, there are changes but you need to know that kinetic energy increases exponentially and potential energy decreases linearly. They have told us that the stone is falling under gravity in a VACUUM, so the answer is no.
For the second last part, there would be an increase in internal energy, because of the increase in kinetic energy, the heating process is still on constant temperature.
The answer is yes.
For the last part, even a vision less person can answer this question, i think you should try this yourself.

 

[Monojit Saha]

Why 0.33 x 0.39I ?

Because it is after the first absroption that the internal reflection occurs. That is I is incident on the muscle and then atenuation or absroption occurs and then it reaches the boundary where it is internally reflected when it is comming back it is atenuated again.

 

[Champ101]

Describe the change to K.e, P.e and total internal energy of the molecules of a block of ice as it melts at 0 degree celcius ?
anyone?

 

[A star]

First, it's essential that you know the meaning and definition of internal energy.
Internal Energy: Internal Energy of a substance is equal to the sum of the kinetic and potential energies of all of it's particles.
Q2 (a) - When you freeze water, there is obviously no change in it's height and kinetic energy decreases because molecules are being cooled, so there is no increase in internal energy of the body, in fact there is a decrease. Answer is no.
For the second part, there are changes but you need to know that kinetic energy increases exponentially and potential energy decreases linearly. They have told us that the stone is falling under gravity in a VACUUM, so the answer is no.
For the second last part, there would be an increase in internal energy, because of the increase in kinetic energy, the heating process is still on constant temperature.
The answer is yes.
For the last part, even a vision less person can answer this question, i think you should try this yourself.

yes but the change in internal energy of a system= work done on/by a gas + change in thermal energy of the system
in the freezing part the temprature is constant but there is work done on the gas by the atmosphere cause it contracts. or is the oposite cause of abnormal behaviour of water?

 

[A star]

First, it's essential that you know the meaning and definition of internal energy.
Internal Energy: Internal Energy of a substance is equal to the sum of the kinetic and potential energies of all of it's particles.
Q2 (a) - When you freeze water, there is obviously no change in it's height and kinetic energy decreases because molecules are being cooled, so there is no increase in internal energy of the body, in fact there is a decrease. Answer is no.
For the second part, there are changes but you need to know that kinetic energy increases exponentially and potential energy decreases linearly. They have told us that the stone is falling under gravity in a VACUUM, so the answer is no.
For the second last part, there would be an increase in internal energy, because of the increase in kinetic energy, the heating process is still on constant temperature.
The answer is yes.
For the last part, even a vision less person can answer this question, i think you should try this yourself.

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_42.pdf Q2a(i) second part how did he find out the mass :S