Physics: Post your doubts here!

nishan2052

nishan2052

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when we divide quantity by something.what will be the uncertainty of new value? mj/10/52 question number two.plz someone help
 
Farru

Farru

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TyRaNizE said:
Guys Please help me....The Q2 (b) of this paper http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_52.pdf ...Im not able to find the absolute uncertainty of T^2, im not able to calculate the T as well....anybody plz help!
Click to expand...

in the beginning they have written the 10 oscillations are taken, thus we have to divide the time with 10, to find the time for EACH oscillation.
uncertainity: (T^2 - Upper limit^2)

hope u get it..
 
S

sara kamal

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zackle09 said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_11.pdf

how do you do question 13, 15 and 22?
Also for 21..how is it C? i just got the answer as 0.1
Click to expand...


Q13
torque with 0.1m=3Nm,so by cross multiplying find torque with 0.15m,that is=4.5Nm.
then find force for both the torques by F=torque/diameters in metres....
add both the forces ,that's equal to tension.

Q15
mass is inversely propotional to velocities,
so if velocity of 2kg trollry =2m/s then velocity of 1 kg=4m/s
find out the kinetic energy of both trolleys by using 0.5mv2
and add both kinetic energies.

Q22
find cross sectional area of wire using 2pi(0.00025)
the assume original length as any number like 2m
then by using stress=force/area find stress
and then apply formula of youg modulus =stress x original length/extension to find extension...
then( extension/original length+ extension)x 100

hope it helped.
 
TaffsAsLevel

TaffsAsLevel

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Farru said:
its a simple transformer :/

the pic I have uploaded shows the 2wires winded..
plus the bold wire shows wire y, and the other one is x..

if u gt ths diagram abt how they will wind up.lemme know, othrwse I will make the whole diagram..
:)
Click to expand...


But I got this from a textbook, how e.m.f is induced between two coils. What about this then? But maybe yours is right since it says coil Y winded around coil X. It's confusing. In the textbook written is exactly what the experiment wants us to do, current in coil1 and induced e.m.f in coil2
 

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T

Trash Can

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how to draw the error bars when the errors are in x-axis??? will the error bars be horizontal????in that case,will the worst acceptable line be drawn from the extreme right error of the first point to the xtreme left error of the last point????? PLZ REPLY ASAP....
 
Alool

Alool

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A particle of mass 2m and velocity v strikes a wall.
The particle rebounds along the same path after colliding with the wall. The collision is inelastic.
What is a possible change in the momentum of the ball during the collision?
A mv B 2mv C 3mv D 4mv

answer is C.. plz someone explain
 
sumaiyarox:)

sumaiyarox:)

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Trash Can said:
how to draw the error bars when the errors are in x-axis??? will the error bars be horizontal????in that case,will the worst acceptable line be drawn from the extreme right error of the first point to the xtreme left error of the last point????? PLZ REPLY ASAP....
Click to expand...

error bars will be horizontal n u draw two worst acceptable lines frm right to left and left to right n chose d one dat is most deviated frm d best fit line.
u got it?:cautious: :p
 
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