Physics: Post your doubts here!

[furuta]

(v^2)-(u^2)=(0)-(1.0^2)= -1.0
2s = 2*3.5*10^-2=0.07
a=1.0/0.07 = -14.2857ms^-2

omg right thank u so much!!

 

[Mstudent]

omg right thank u so much!!

you are welcome anytime

 

[amina1300]

Y1 will occur again 1/4 lamda later and 1 lamda laterView attachment 62372

Tysmm for the answerss and Can you explain a bit about how you knew that it will occur lamda/4 and lamda later ?

 

[Mstudent]

Tysmm for the answerss and Can you explain a bit about how you knew that it will occur lamda/4 and lamda later ?

you want to find out when you will get the same length of amplitude as y1, so in this case Y1 MUST BE POSITIVE, and the same amplitude will thus occur one wavelength later as two points on a single transverse wave with the same phase difference will have the SAME AMPLITUDE (length from the origin line) (look at the second line in my diagram). The first line is 1/4 lambda later as two points 1/4 lamda later will also have the SAME AMPLITUDE (length from the origin line) .

I'm sorry but explaining this is a bit difficult for me, but I hope you get the idea by looking at my drawing. I'm sorry if I couldn't explain it to you.

I actually have to show you the diagram myself and talk to make you understand, maybe a video, but that's not possible! Words can only take you to till a limit!!

hope it helps you

 

[amina1300]

I

you want to find out when you will get the same length of amplitude as y1, so in this case Y1 MUST BE POSITIVE, and the same amplitude will thus occur one wavelength later as two points on a single transverse wave with the same phase difference will have the SAME AMPLITUDE (length from the origin line) (look at the second line in my diagram). The first line is 1/4 lambda later as two points 1/4 lamda later will also have the SAME AMPLITUDE (length from the origin line) .

I'm sorry but explaining this is a bit difficult for me, but I hope you get the idea by looking at my drawing. I'm sorry if I couldn't explain it to you.

I actually have to show you the diagram myself and talk to make you understand, maybe a video, but that's not possible! Words can only take you to till a limit!!

hope it helps you

I actually do get it now and I realize its so simple . Its just that as we move in the y direction at that very same displacement ....from the rest position (x line). Thankyouu!

 

[Mstudent]

I

I actually do get it now and I realize its so simple . Its just that as we move in the y direction at that very same displacement ....from the rest position (x line). Thankyouu!

you're welcome anytime

 

[Shimmery woods]

help me with question 325 please....how is upthrust greater than force P ? if upthrust is greater than dowmward force wouldn't the sphere float ? i went for option B ...answer is A

 

[amina1300]

help me with question 325 please....how is upthrust greater than force P ? if upthrust is greater than dowmward force wouldn't the sphere float ? i went for option B ...answer is A

The sphere will not move in a diagonal direction so S= Q
For an object submerged in water there will be resultant upthrust force acting on it causing it to move upwards so R>P IT SHOULD FLOAT (e.g place a tennis ball under water it floats.)
(B implies that sphere would sink which is not the case)

 

[amina1300]

http://papers.gceguide.com/A Levels/Physics (9702)/9702_m16_qp_12.pdf
Q37 anyone and 34..35

 

[Holmes]

Q34
P = I^2 R 4.0=I^2(20)
Current in circuit = 0.45 A
V=Ir = 0.45*20 = 9.0 V
From kirchhoff's 2 law 16= 9+0.45R R= 16

Q38 View attachment 62370

Thanks again amina1300

 

[Holmes]

http://papers.gceguide.com/A Levels/Physics (9702)/9702_m16_qp_12.pdf
Q37 anyone and 34..35

Beginning from Q 34:
this is a simple question which requires correct manipulation of kirchoff's 2nd law ;
e.m.f's on one side and the p.d. 's on another side
so if we move from V1 to V2 and then V3 we get sth like
V1 - V2 - V3 ...
and similarly on the other side we get potential drops as ;
IR1 + IR2 + IR3 CAN BE WRITTEN AS I (R1+ R2+ R3)
so consequently we get
V1 - V2 - V3 = IR1 + IR2 + IR3
or as
V1 - V2 - V3 = I (R1+ R2+ R3)

I think i made some argue ment

 

[Holmes]

http://papers.gceguide.com/A Levels/Physics (9702)/9702_m16_qp_12.pdf
Q37 anyone and 34..35

q 35 is quite simple
I hope you are aware of this technique of finding Resistance
R = (R1 * R2)/ (R1 + R2)
so it can be done like
8 = (R* 2R)/(R1 + 2R)
straight it out and you get R= 12

 

[Holmes]

amina1300
http://papers.gceguide.com/A Levels/Physics (9702)/9702_m16_qp_12.pdf
Q37 anyone and 34..35

here
Q 37 now
it tells us that External pd is 7v so we can find I by :
12-7=I * 0.1
:. I = 50 A

 

[Holmes]

I hope I am helping you amina1300

 

[GarryTheGhost]

need urgent help for these physics questions. plz show workings/show why, answers are written with the questions.

 

[Holmes]

M/J 2016 (13)

 

[Holmes]

O/N 2016 (13)

 

[Holmes]

O/N 2016 (13)

 

[Holmes]

O/N 2016 (13)
with vivid working please !

 

[Holmes]

M/J 2016 (13)
Explain please