Author Topic: Edexcel PHYSICS Doubts  (Read 136072 times)

Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #885 on: January 19, 2012, 02:11:20 pm »
@ 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 :o that is what my textbook says and also wikipedia
Here: http://en.wikipedia.org/wiki/Lepton (check the leptop table)
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Re: Edexcel PHYSICS Doubts
« Reply #886 on: January 19, 2012, 02:50:49 pm »
You're right ..My bad (:
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Offline dk bose

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Re: Edexcel PHYSICS Doubts
« Reply #887 on: January 21, 2012, 08:06:50 am »
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!!!!

Offline dk bose

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Re: Edexcel PHYSICS Doubts
« Reply #888 on: January 21, 2012, 08:26:58 am »
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!!!

Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #889 on: January 21, 2012, 01:34:31 pm »
Anyone?

The answer is B but i dont get how :s

And Q9 of the paper attached
« Last Edit: January 21, 2012, 01:59:41 pm by Ang3l »
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Offline dk bose

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Re: Edexcel PHYSICS Doubts
« Reply #890 on: January 21, 2012, 02:23:28 pm »
@ 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.

Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #891 on: January 21, 2012, 06:31:33 pm »
^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
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Re: Edexcel PHYSICS Doubts
« Reply #892 on: January 21, 2012, 08:03:39 pm »
I'm confused ..Which ones do you have doubts in ?
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Offline dk bose

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Re: Edexcel PHYSICS Doubts
« Reply #893 on: January 22, 2012, 05:48:30 am »
@ GG, can you please solve my above two doubts!!! itz urgent!!! plzzz help me!!!!

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Re: Edexcel PHYSICS Doubts
« Reply #894 on: January 22, 2012, 06:37:15 am »
I wrote your Questions in the Physicsforums.com  , Click HERE to view!

I hope Mr.Paul would answer you though :)


I hope I helped :D
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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #895 on: January 22, 2012, 09:45:32 am »
I'm confused ..Which ones do you have doubts in ?
Q9 of unit 4 jan 2010

Q6 a (i - iv) of jun 2011
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Re: Edexcel PHYSICS Doubts
« Reply #896 on: January 22, 2012, 01:11:11 pm »
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 (: 


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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #897 on: January 22, 2012, 07:59:56 pm »
^ I understand

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

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Re: Edexcel PHYSICS Doubts
« Reply #898 on: January 23, 2012, 05:57:41 pm »
How do you find the Max current?
When t = 0, the markscheme says it is 1.6/16 = 100mA
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Offline MKh

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Re: Edexcel PHYSICS Doubts
« Reply #899 on: January 23, 2012, 06:17:04 pm »
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.