Edexcel PHYSICS Doubts

[Malak]

@ Ang3l : Welcome.  ... Muon is a Hadron and a meson but not a BARYON ..my teacher ALWAYS said a Mesons are NOT Baryons ..NEVER Mix them up. Thanks by the way (:

@ MKh : ALL my documents are 2007 version , I suggest you download a converter (Google :Word document 2007 to 2003 converter and iA you'll be able to find what you want (: )

Yeah, that is right mesons are not baryons
...but a muon is not a hadron, it is a lepton that is what my textbook says and also wikipedia
Here: http://en.wikipedia.org/wiki/Lepton (check the leptop table)

[The Golden Girl =D]

You're right ..My bad (:

[dk bose]

In Formula One racing, cars often take corners at speeds in excess of 50 m s^-1, and
so there is a very real danger of skidding.
a)At a corner of radius 260m the track is banked at 20°. Calculate the maximum speed if no frictional force is required.
plzz anyone solve this question and give the solutions as fast as possible!!!!

[dk bose]

The next part of the above question is also my doubt.the question is as follows-
(b)'Downforce' is used to keep a car in contact with the track. The motion through the air produces a force perpendicular to the direction of travel, pushing the car onto the track. A racing car of mass 720 kg takes an unbanked corner of radius 550 m at a speed of 50 m s^-1. The maximum frictional  force is           0.4 x (reaction from track).Calculate the downforce necessary to prevent the car from skidding outwards.

plzz solve this sum also and give the solutions as fast as possible!! itzzz urgent!!!!plzzz help me!!!

[Malak]

Anyone?

The answer is B but i dont get how :s

And Q9 of the paper attached

[dk bose]

@ Angl,i know how to get the answer of the first question- First,substitute mass of an electron and the velocity (given in the question) in the equation for kinetic energy,E=.5mv².Then substitute this value in this equation,E=qV,where q is the charge of an electron and V is the p.d.

[Malak]

^Thanks.

Can anyone give me an answer to the above question and plus Q6 part a (i) to (iv) of the paper attached


Thanks a lot

[The Golden Girl =D]

I'm confused ..Which ones do you have doubts in ?

[dk bose]

@ GG, can you please solve my above two doubts!!! itz urgent!!! plzzz help me!!!!

[The Golden Girl =D]

I wrote your Questions in the Physicsforums.com  , Click HERE to view!

I hope Mr.Paul would answer you though


I hope I helped

[Malak]

I'm confused ..Which ones do you have doubts in ?

Q9 of unit 4 jan 2010

Q6 a (i - iv) of jun 2011

[The Golden Girl =D]

Q9 of unit 4 jan 2010

[ I'm studying Math currently so can only answer this part    ]


My teacher's Answer :

When the circuit is closed (Switched ON) the current in the circuit grows from Minimum to Maximum and therefore the magnetic field around the coil also grows and this induces Emf in the coil. This is called Self-Induction.

When the circuit is Switched OFF ,the current in the coil falls RAPIDLY and causes the Magnetic field around the Coil to COLLAPSE SUDDENLY and this has Emf that is sufficient to LIGHT UP the Neon Lamp.


I hope I helped (: 

[Malak]

^ I understand

Thanks a lot for replying even though you have an exam tomorrow =)

[Malak]

How do you find the Max current?
When t = 0, the markscheme says it is 1.6/16 = 100mA

[MKh]

How do you find the Max current?
When t = 0, the markscheme says it is 1.6/16 = 100mA

Io = 1.6 V/16 ohms = 10 A = 100mA ---> this is how it must have been worked out.

Io is actually initial current (yes, max. current). But what i don't understand over here is how do we get 1.6V - isn't it supposed to be 12 V as clearly stated in the question?

I think it is a misprint.