Physics: Post your doubts here!

[Thought blocker]

The trick in this question is to remember that the height in mgh is from the bottom of the object. Thus, when using mgh, we will use 72 and 37cm as its height, subtracting the diameter. Thus
mgh = KE
9.81*.72*m = 0.75
m = .106g
.106* 9.81*.37 = KE
KE = .385 = B

Oh, I got A

 

[agha saad 22]

Mass of wind coming in contact with the blades per second = density * speed * area = 475.2 kg/s

F = mv-mu/t As it is 475.2 kg/s, we will use
F = 475.2*0 - 475.2*33/1 = D

D*S*A kahan say derive kiya hai?

 

[usama321]

D*S*A kahan say derive kiya hai?

Check the units

 

[meerul264]

As CB also has resistance, just think of it as another resister in series with the two parallel resistors. now if the emf of the batter is 6v (dont remember the question), some of the voltage would be dissipated across the CB resistor first, and the rest of 6v is then equally dissipated across the two parallel resistors

View attachment 39686anothe

I see, so you treat AC as if it's resistors combined in parallel?

And voltage dissipated across CB first? despite the direction conventional current?

 

[usama321]

I see, so you treat AC as if it's resistors combined in parallel?

And voltage dissipated across CB first? despite the direction conventional current?

Not dissipated first. But not all is equally distributed across the parallel wires. Some is left and dissipated across CB

 

[agha saad 22]

Check the units

naee i mean kin formulas say derive kiya hai?? like KAI VALUES KO DEKH KAI KHUD m/s nikala hai!!?

 

[Suchal Riaz]

does anyone want readings for practicals so he can practice out the working and graph area?

 

[Suchal Riaz]

Oh, I got A

you should be happy if you get A

 

[asma tareen]

does anyone want readings for practicals so he can practice out the working and graph area?

Meeeee ._.

 

[Suchal Riaz]

Meeeee ._.

okay dadi. it's uploading

 

[Thought blocker]

you should be happy if you get A

I mean, I got wrong answer. :'(

 

[Thought blocker]

okay dadi. it's uploading

Me too

 

[agha saad 22]

okay dadi. it's uploading

chemistry kai :3

 

[Suchal Riaz]

summer 2013 practicals 33
readings only
https://www.dropbox.com/s/sokx40nb7zdzuc8/S13-33.pdf

 

[asma tareen]

summer 2013 practicals 33
readings only
https://www.dropbox.com/s/sokx40nb7zdzuc8/S13-33.pdf

Shukriya

 

[Thought blocker]

summer 2013 practicals 33
readings only
https://www.dropbox.com/s/sokx40nb7zdzuc8/S13-33.pdf

Aye haye! Thanks dude!

 

[agha saad 22]

summer 2013 practicals 33
readings only
https://www.dropbox.com/s/sokx40nb7zdzuc8/S13-33.pdf

CLAPS FOR XPC TEACHER

 

[Thought blocker]

summer 2013 practicals 33
readings only
https://www.dropbox.com/s/sokx40nb7zdzuc8/S13-33.pdf

POINTER !

 

[usama321]

naee i mean kin formulas say derive kiya hai?? like KAI VALUES KO DEKH KAI KHUD m/s nikala hai!!?

It's kg/s. And khud try ker k nikala hai Though search it online, zarur hoga.. Kg/m^3 *m/s = kg/m^2 s.This means, one kg per second per m^2 of area. Just multiply with the number of m^2 (area) you have and you get kg/s on that specified area.

 

[Suchal Riaz]

the sixth reading of question one is wrong maybe.