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Physics: Post your doubts here!

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bomberblitz

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Oliveme said:
13)
View attachment 27641

22) Volume = mass/density = 3.5 x 10^-25 kg / 9.2 x 10^3 kg m^-3
= 3.36 x 10^-10 m^3
So, answer is C.
Click to expand...

Q13--shouldn't the force acting on the box viewed as a horizontal force force to the left? the pulley converts the weight of the mass to that force.
Anyhow I don't get (8-6)x9.81 as 8.0 is the mass in kg's, 6.0 is the frictional force in units N. Can u plz explain it a bit:)
 
S

shreeya95

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anishniroula said:
I think after writing this eqn we should say that that are directly propotional and if one changes it affects to another..
Click to expand...

mark scheme says that This mark is not scored for Rbeing proportional to l^2. so how do we write the conclusion that confirms the relationship between R and l??
 
Oliveme

Oliveme

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TaffsAsLevel said:
Hey hey can you help me again, this time it's paper 5 june 2007 :confused::sick:(n) , if for example l is a quantity in cm with an uncertainty +- 0.4, so what happen to the uncertainty if they ask for l^2
Click to expand...
Let's assume l is 10.2 (+- 0.4). When l is squared, we square the two extreme points and subtract them to get uncertainty in the l squared value.
10.2^2 = 104.04 and uncertainty = (10.2+0.4)^2 - (10.2-0.4)^2
= 10.6^2 - 9.8^2
= 112.36 - 96.04 = 16.32
So, we have 104.04 (+- 16.32).
Hope you get it.
 
Oliveme

Oliveme

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Anyhow I don't get (8-6)x9.81 as 8.0 is the mass in kg's, 6.0 is the frictional force in units N. Can u plz explain it a bit:)
Click to expand...


We subtract the two to get the resultant force. Frictional force opposes the driving force and so the total force becomes 2N.
 
TaffsAsLevel

TaffsAsLevel

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Oliveme said:
Let's assume l is 10.2 (+- 0.4). When l is squared, we square the two extreme points and subtract them to get uncertainty in the l squared value.
10.2^2 = 104.04 and uncertainty = (10.2+0.4)^2 - (10.2-0.4)^2
= 10.6^2 - 9.8^2
= 112.36 - 96.04 = 16.32
So, we have 104.04 (+- 16.32).
Hope you get it.
Click to expand...


Daaayyyuumm thanksss a ton :D:D:D:D:D:D:D you know everything
 
kiara15

kiara15

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can any1 guide me how to calculate absolute errors in gradient and y intercept? alsoow to how to draw worst fit line in graph? plzz
 
kiara15

kiara15

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can you guide me how to calculate absolute errors in gradient and y intercept? alsoow to how to draw worst fit line in graph? plzz
 
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anishniroula

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shreeya95 said:
mark scheme says that This mark is not scored for Rbeing proportional to l^2. so how do we write the conclusion that confirms the relationship between R and l??
Click to expand...
yeah! mark scheme says to construct this equation and says nothing about statement. so i think we should construct the eqn and state the relationship. This is all we can do.
 
geminisign

geminisign

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For practical paper number 3 (AS Level) when they ask you "Explain whether your results support the suggested relationship."

The answer is "Valid conclusion based on the calculated values of k. Candidate must testagainst a stated criterion. "

What is a stated criterion? Can I have a few examples? Thanks!
 
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