Physics: Post your doubts here!

[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

 

[Catherine7532]

25 A wire stretches 8 mm under a load of 60 N.
A second wire of the same material, with half the diameter and a quarter of the original length of
the first wire, is stretched by the same load.
Assuming that Hooke’s law is obeyed, what is the extension of this wire?
A 1 mm B 4 mm C 8 mm D 16 mm

 

[Venkata Gurrala]

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 %

well, when you subtract 1.27 and 0.83, you get 0.44. However, you always add the uncertainties. you never subtract them just because the values are being subtracted. So when you add 0.02 and 0.01 and get 0.03, divide 0.03 by 0.44 *100 and you should get around 7%

 

[..sacrifice4Revenge..]

Same to you buddy
remember me in your prayers

How does the current divide in parallel? Im totally lost abt it.

And plz take a look at these

 

[Catherine7532]

VOLTAGE= 3.0-1.2 = 1.8V
RESISTANCE = 9.0
CURRENT = 1.8 / 9.0 = 0.2A

 

[ZaqZainab]

How does the current divide in parallel? Im totally lost abt it.

And plz take a look at these
View attachment 45299

just like resistance
1/I=1/I1+1/I2.....................
Here we don't need that

 

[..sacrifice4Revenge..]

just like resistance
1/I=1/I1+1/I2.....................
Here we don't need that