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Physics: Post your doubts here!

Mahnoorfatima

Mahnoorfatima

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the distance travelled for negligible air resistance should be a straight line No? why is it curve? when there's no resistance which means that there nothing to slow the speed down which would increase the distance?
And, why would a smaller mass result in a larger kinetic energy if momentum is conserved? for a smaller mass shouldn't the ke be smaller as compared to a larger mass?
 
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The Sarcastic Retard

The Sarcastic Retard

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TheJDOG

TheJDOG

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NIM said:
Guys need help !!
http://studyguide.pk/Past Papers/CIE/International A And AS Level/9702 - Physics/9702_w09_qp_41.pdf
Q# 6a,b,
Q#7a,b,c
Any help will be appreciated!!
Click to expand...

Hey I attached them for you.
For Q6 a) use right hand rule, thumb along current direction and other fingers along magnetic flux direction.
b) i) use Flemings left hand rule, thumb is direction of force, first finger direction of flux and second finger direction of current, then, do this to both magnetic field of earth and magnetic field due to wire, you'll see forces at Point P will be equal and opposite.
ii) just use given equation and substitute


Yes, my sketches are very bad , I'm sorry :/
Also, I just checked the ms, why am I not allowed to say increase R for more smoothing, only larger capacitor, anyone could explain this to me please? This is Q7 c)ii)1)
Also, tell me if I have any mistake and thanks
 

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hassan1_OM

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who knows how to hack an email ?? urgently needed and for sure can hack the email not i think or ill try... for AS
 
Suchal Riaz

Suchal Riaz

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mr dam bhai said:
m/j /2005/paper4/q7 last part please explain me properly
Click to expand...
initially mass was 1.4x10-6 g. when one nucleus of Mg decays it produces one nucleus of Fe. that means mass of Mg that has decayed = mass of Fe produced. that means total mass will always be equal to 1.4x10-6 g
Mfe/Mmg=9 but mfe+mmg=1.4x10-6
substitution of one equation into another gives 9Mmg+Mmg=1.4x10-6 that gives 10Mmg=1.4x10-6 or Mmg=1.4x10-6 / 10 which means 1/10 th of the initial value. got it?
in one half life mass is 1/2 in two half lives mass is 1/4 so if there are n half lives mass is (1/2)^n
1/2^n = 1/10
find n using log properties as n=3.32
so total time = half life * n = 3.32*2.6 = 8.63 hours
 
NIM

NIM

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TheJDOG said:
Hey I attached them for you.
For Q6 a) use right hand rule, thumb along current direction and other fingers along magnetic flux direction.
b) i) use Flemings left hand rule, thumb is direction of force, first finger direction of flux and second finger direction of current, then, do this to both magnetic field of earth and magnetic field due to wire, you'll see forces at Point P will be equal and opposite.
ii) just use given equation and substitute


Yes, my sketches are very bad , I'm sorry :/
Also, I just checked the ms, why am I not allowed to say increase R for more smoothing, only larger capacitor, anyone could explain this to me please? This is Q7 c)ii)1)
Also, tell me if I have any mistake and thanks
Click to expand...
Thankyou so much for help but can u plz show me the exact position of P in Q#6 ii
And question 7 b, question # 10 also
 
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