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Physics: Post your doubts here!

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
 
TaffsAsLevel

TaffsAsLevel

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Any one can help me with M/J 2011 paper 51 question 2 (d) and so on. How can you get the uncertainty of N if gradient=(NkT/A) Pleaase help, just the uncertainty
 
Z

zackle09

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sara kamal said:
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.
Click to expand...

it really did! thanks alottt
 
S

sara kamal

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Yousif Mukkhtar said:
Anyone can help me, please:
Q23:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_1.pdf
Q6
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s08_qp_1.pdf
Q11 VERY SERIOUS DOUBT
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w08_qp_1.pdf
Q3
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_qp_1.pdf
Click to expand...


Q23
first find frequency of wave using f=speed/wavelength that is = 6.25Hz
then find speed of particle P=2 x 2(amplitude)x pi x 6.25
then use formula of kinetic energy to find max K.E that will be 0.00404J=4.04mJ

Q6
obviously if we apply force perpendicular to the direction of motion,the direction would change bt since no force is applied parallel to motion,the there will be no change in speed.....

Q11
first find out force produced by mass,F=2 x 9.81=19.62N

find out the resultant force acting on the block by F =19.62-6=13.62N

hence acceleration of block=resultant force/total mass=13.62/10=1.362=1.4m/s2


Q3
just find change in temperature using Final -initial=14-(-6.5)=20.5C
 
Y

Yousif Mukkhtar

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sara kamal said:
Q23
first find frequency of wave using f=speed/wavelength that is = 6.25Hz
then find speed of particle P=2 x 2(amplitude)x pi x 6.25
then use formula of kinetic energy to find max K.E that will be 0.00404J=4.04mJ

Q6
obviously if we apply force perpendicular to the direction of motion,the direction would change bt since no force is applied parallel to motion,the there will be no change in speed.....

Q11
first find out force produced by mass,F=2 x 9.81=19.62N

find out the resultant force acting on the block by F =19.62-6=13.62N

hence acceleration of block=resultant force/total mass=13.62/10=1.362=1.4m/s2


Q3
just find change in temperature using Final -initial=14-(-6.5)=20.5C
Click to expand...

Thank you for the great help.
 
T

Twinks05

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When drawing error bars how long do the error bars have to be? Do each of the length of the error bars depend on their uncertainty or are all the same length?
Also, how do you draw the worst line of best fit??

Please help, this is emergency!
 
D

danyaljamil

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Twinks05 said:
When drawing error bars how long do the error bars have to be? Do each of the length of the error bars depend on their uncertainty or are all the same length?
Also, how do you draw the worst line of best fit??

Please help, this is emergency!
Click to expand...

it depends on uncertainity just divide the error by value of 1 division and you get no of boxes and steepest line from left to right of error bar of first and last bar making sure it passes through all bars
 
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