Physics: Post your doubts here!

[MiniSacBall]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w13_qp_11.pdf
Nov-2013 P11 Q8

Well, i am starting to hate physics as i go deep into it, or at-least since i started IGCSE Physics! -_-
Here is the answer:

This question can only be solved by taking an example:-
So take a distance of 1200 km
this takes 2 hours outwards, and 3 hours homewards.
Total time = 5 hours
total distance = 2400 km (Outwards and back! )
speed = 2400 / 5 = 480 km/hr .

You can take multiple examples, and still get the same answer.
Well i guess you tried adding 600 with 400 and dividing by 2 to find the average !

 

[saadkhan97]

Y

You* know that c = f x λ yes ?
now f = 1 / t
so c = λ / t
t = λ / c..
Now you can see from the figure that total wavefronts b/w XY and P is 3
so t = 3λ / c
Hence C option is correct.

thanks alot tania

 

[Ahmed Aqdam]

Well, i am starting to hate physics as i go deep into it, or at-least since i started IGCSE Physics! -_-
Here is the answer:

This question can only be solved by taking an example:-
So take a distance of 1200 km
this takes 2 hours outwards, and 3 hours homewards.
Total time = 5 hours
total distance = 2400 km (Outwards and back! )
speed = 2400 / 5 = 480 km/hr .

You can take multiple examples, and still get the same answer.
Well i guess you tried adding 600 with 400 and dividing by 2 to find the average !

I wasn't asking this, just telling which question this paper was from Thanks anyway

 

[ZaqZainab]

I wasn't asking this, just telling which question this paper was from Thanks anyway

I like the way the members here are so eager to help each other

 

[MiniSacBall]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_11.pdf

Q19

Also Q27

 

[Ahmed Aqdam]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_11.pdf

Q19

Mass of water=1.5*1000=1500 kg
Mass of alcohol=0.5*800=400 kg

Total mass=1900 kg
Total volume=2.0 m^3

Density=1900/2=950 kg m^-3

 

[MiniSacBall]

Mass of water=1.5*1000=1500 kg
Mass of alcohol=0.5*800=400 kg

Total mass=1900 kg
Total volume=2.0 m^3

Density=1900/2=950 kg m^-3

God Bless all of you guys <3, and now just Q27 same paper

 

[Venkata Gurrala]

Haven't I heard of your exploits elsewhere?
Either ways, do you have a doubt concerning this question?

Good Luck for your exams!

Haha yea. Thanks!

 

[Ahmed Aqdam]

God Bless all of you guys <3, and now just Q27 same paper

According to the equation n*lamda=d*sin theta
n is 3.33 so 3 images from X to Y, 3 from Y to Z and 1 zero order at Y so total 7.

 

[ZaqZainab]

Mass of water=1.5*1000=1500 kg
Mass of alcohol=0.5*800=400 kg

Total mass=1900 kg
Total volume=2.0 m^3

Density=1900/2=950 kg m^-3

So much chemistry

 

[MiniSacBall]

According to the equation n*lamda=d*sin theta
n is 3.33 so 3 images from X to Y, 3 from Y to Z and 1 zero order at Y so total 7.

Well, how did you calculate the value of theta, I mean i didn't how to find n,
I was trying on d sin theta = n lamda,
I found out d but couldn't figure out the value of theta:/

 

[Ahmed Aqdam]

Well, how did you calculate the value of theta, I mean i didn't how to find n,
I was trying on d sin theta = n lamda,
I found out d but couldn't figure out the value of theta:/

Theta is 90 degrees as X and Z are parallel to the grating.

 

[Catherine7532]

How is the answer D?

5 A quantity x is to be determined from the equation
x = P – Q.
P is measured as 1.27 ± 0.02 m.
Q is measured as 0.83 ± 0.01 m.
What is the percentage uncertainty in x to one significant figure?
A 0.4 % B 2 % C 3 % D 7 %

 

[MYLORD]

friends i found this website related to physics
so if u may have any doubt u may refer it http://earlhaig.ca/departments/science/physicsreview.php
Hope it helps
I KNOW ITS KINDA OF LATE SOOOOOOOORRRRRRRRRRRYYYYYYYYY

 

[ZaqZainab]

How is the answer D?

5 A quantity x is to be determined from the equation
x = P – Q.
P is measured as 1.27 ± 0.02 m.
Q is measured as 0.83 ± 0.01 m.
What is the percentage uncertainty in x to one significant figure?
A 0.4 % B 2 % C 3 % D 7 %

P-Q=1.27-0.83=0.44
but unceritnities always add up
sp 0.02+0.02=0.03
(0.03/0.44)*100
is the answer D

 

[Ahmed Aqdam]

How is the answer D?

5 A quantity x is to be determined from the equation
x = P – Q.
P is measured as 1.27 ± 0.02 m.
Q is measured as 0.83 ± 0.01 m.
What is the percentage uncertainty in x to one significant figure?
A 0.4 % B 2 % C 3 % D 7 %

P-Q is 0.44. Uncertainty adds so 0.03
0..03/0.44*100=7%

 

[ZaqZainab]

friends i found this website related to physics
so if u may have any doubt u may refer it http://earlhaig.ca/departments/science/physicsreview.php
Hope it helps
I KNOW ITS KINDA OF LATE SOOOOOOOORRRRRRRRRRRYYYYYYYYY

Thanks

 

[MYLORD]

Thanks

Ur welcome sis
best of luck for the deadbeat exam

 

[ZaqZainab]

Ur welcome sis
best of luck for the deadbeat exam

Same to you buddy
remember me in your prayers

 

[MYLORD]

Same to you buddy
remember me in your prayers

Sure anytime