Physics: Post your doubts here!

[asd]

Gud Luk to u too A star
go ace the exam

Yeah, If you dont get no Astar Ill unfollow you.
Oh wait, there is no A star in AS :|

 

[asd]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_21.pdf

Q1b) Apparently the units cancel out? How the hell..?

P=F/A
= ma/m^2
= kgms^-2/m^2
=kgm^-1 s^-2

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_21.pdf

Q1b) Apparently the units cancel out? How the hell..?

they do work them out

 

[A star]

Yeah, If you dont get no Astar Ill unfollow you.
Oh wait, there is no A star in AS :|

lmfao :O asd u better do it now

 

[hela]

Why does the small rain drop reach terminal velocity faster than a larger rain drop ? please give a detailed explanation thank you

 

[asd]

Why does the small rain drop reach terminal velocity faster than a larger rain drop ? please give a detailed explanation thank you

Now that was totally random
Okay, so I guess cause the smaller drop has less weight, so the force required by the air resistance to counter the weight is obv smaller now. It will take less time.

 

[TaffsAsLevel]

Why does the small rain drop reach terminal velocity faster than a larger rain drop ? please give a detailed explanation thank you

mg of smaller raindrop< mg of larger raindrop, therefore it will take less time for resistive force to overcome the smaller raindrop hence reaches terminal velocity faster, (my thought)

 

[daredevil]

Now that was totally random
Okay, so I guess cause the smaller drop has less weight, so the force required by the air resistance to counter the weight is obv smaller now. It will take less time.

but the surface area exposed will also be less so air resistance will take more time to bring the drop to its terminal velocity.. nahi?

 

[TaffsAsLevel]

Guys what about June 2002 on waves, (b.) part where it is a laser being diffracted in grating and made an angle of 162 and 136 degrees thing, I don't get it at all =(

 

[daredevil]

Guys what about June 2002 on waves, (b.) part where it is a laser being diffracted in grating and made an angle of 162 and 136 degrees thing, I don't get it at all =(

link?

 

[goodluckayesha]

Guys what about June 2002 on waves, (b.) part where it is a laser being diffracted in grating and made an angle of 162 and 136 degrees thing, I don't get it at all =(

whts the doubt? its an easy quest I jus did it now if I can help I will

 

[TaffsAsLevel]

link?

It's not there in the xtremepapers site, can you upload it here? I have it in my desktop a classified one

 

[axetreme.O]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_22.pdf
4(b)(i)and (ii)

 

[goodluckayesha]

It's not there in the xtremepapers site, can you upload it here? I have it in my desktop a classified one

 

[TaffsAsLevel]

whts the doubt? its an easy quest I jus did it now if I can help I will

Can you explain me what are those angles? And why theta would be (1/2)(162-136)?

 

[goodluckayesha]

Can you explain me what are those angles? And why theta would be (1/2)(162-136)?

in diffraction grating its always a rule to divide angle by 2 in other questions of this type we r always given a single angle but here we r given side angles n we need to get the angle in between so 162-136=26 then 26/2=13 n then the usual way dsin(teta)=n(lambda)

 

[TaffsAsLevel]

7(b) the mark scheme said theta= (1/2)(162-136), why?

 

[TaffsAsLevel]

in diffraction grating its always a rule to divide angle by 2 in other questions of this type we r always given a single angle but here we r given side angles n we need to get the angle in between so 162-136=26 then 26/2=13 n then the usual way dsin(teta)=n(lambda)

But why is it then? Why the rule is like that =( ?

 

[goodluckayesha]

7(b) the mark scheme said theta= (1/2)(162-136), why?

they have given it the other way round in the mark scheme
have u seen the repeated diffraction grating question in mcQs where diffraction grating angle is given as 70 but we use 35 cuz thts a rule to divide the angle by 2

 

[goodluckayesha]

But why is it then? Why the rule is like that =( ?

why is it wht? tell me ur doubt clearly so I cn xplain bttr
umm n a rule is a rule we cnt chng it....