Physics: Post your doubts here!

[princess Anu]

Somebody please help me out with this!!

Q: The pressure p and Volume V for a given mass of gas may be given by (p+a/v2) (V-b) = c.
Find the units of a, b and c.

 

[Thought blocker]

pls help me with this thx View attachment 46948

Somebody please help me out with this!!

Q: The pressure p and Volume V for a given mass of gas may be given by (p+a/v2) (V-b) = c.
Find the units of a, b and c.

Zepudee

 

[Thought blocker]

Somebody please help me out with this!!

Q: The pressure p and Volume V for a given mass of gas may be given by (p+a/v2) (V-b) = c.
Find the units of a, b and c.

You can't add a pressure to a temperature, it does not make sense. So the a/v2 must have units of pressure if it is to be added to p. Similarly b must have units of volume.
Therefore, b has units= m^3
a/v^2 must have unit the same as pressure so,
N/m^2 = a/(m^3)^2
a =Nm^6/m2
a =Nm^4
c = N/m^2 x m^3 = Nm

 

[princess Anu]

You can't add a pressure to a temperature, it does not make sense. So the a/v2 must have units of pressure if it is to be added to p. Similarly b must have units of volume.
Therefore, b has units= m^3
a/v^2 must have unit the same as pressure so,
N/m^2 = a/(m^3)^2
a =Nm^6/m2
a =Nm^4
c = N/m^2 x m^3 = Nm

Thanks a lot.
May Allah bless you.

 

[Duaa Akhtar]

Hey can I get an A* in phy if I got A in P1 and P2 but B in practical? and how plzzzzz???

 

[Thought blocker]

Hey can I get an A* in phy if I got A in P1 and P2 but B in practical? and how plzzzzz???

Yes you can get A* with this As level grades.
What was that "how" for?

 

[ameeen]

AOA.
i am stuck in multiplication of vectors section can any one has the notes of cross and dot product so kiand send me
thanks

 

[Thought blocker]

AOA.
i am stuck in multiplication of vectors section can any one has the notes of cross and dot product so kiand send me
thanks

This is physics thread, I guess.

 

[akshay 999]

I dont get the question.
Moreover this is the first time I have came across this type. Which paper it is!

November 2000 paper 1 question number 27

 

[Thought blocker]

November 2000 paper 1 question number 27

https://www.xtremepapers.com/commun...st-your-doubts-here.9860/page-592#post-850697

 

[akshay 999]

Ans C. All other values are (integral) multiple of it. A and B are too small - no info about them from values given

THere was once are question like in multiple choice - one of the recent years. I don't remember which one though.

No its not C but B i have check it in the answer sheet.

 

[The Godfather]

just use the cambridge application booklet + see the worked solutions from the link in my signature below.

this should be enough

If this was enough, everyone would have touch the A*s!

 

[The Godfather]

if you don't get an A* after studying these notes and practicing all these past exam questions (you are even provided with their solutions there), then REALLY i don't know what to do to obtain an A*.

I need notes apart from textbook and past papers doesn't help to score A* if it does then all the candidates SHOULD have had score A*.

 

[Duaa Akhtar]

Yes you can get A* with this As level grades.
What was that "how" for?

i mean what things to emphasise more on to get an A*?

 

[Thought blocker]

i mean what things to emphasise more on to get an A*?

Ask Physicist

 

[akshay 999]

SORRY I made an error. Answer is indeed B. FOR the same reason I told you in my earlier post - due to the integral multiple. From ans C, we do not always obtain integral multiples. But with B, we can. A is wrong because if we divide ans B by integers, we would have to say that all of them are correct.

SORRY again.

hi can you plz post the answer in details and explaining the calculations you have done coz i am a bit confusing wiz the answer in the june 2012 paper. And thnks 4 the help

 

[princess Anu]

Any tip on answering mass related questions? for example mass of an apple?

 

[Thought blocker]

Any tip on answering mass related questions? for example mass of an apple?

Here :¬

 

[akshay 999]

Which one, the one you had a problem with or the June 2012?

the one that i have posted

 

[akshay 999]

Check comment at http://physics-ref.blogspot.com/2014/05/physics-9702-notes-worked-solutions-for.html

Thanks, the explanations have helped me a lot