Physics Help Paper . [Calculations Questions]

[Adil0809]

Guys I do the pastpapers and I get through it. But when I check it with Markscheme, they use different formula for finding same thing (SUVAT equations) and my answer is close to their but not same.
Will my marks be deducted or is there a way to know which Equation to use. Please help. Since paper is in less than 12 hrs.

 

[omaaaar]

Guys I do the pastpapers and I get through it. But when I check it with Markscheme, they use different formula for finding same thing (SUVAT equations) and my answer is close to their but not same.
Will my marks be deducted or is there a way to know which Equation to use. Please help. Since paper is in less than 12 hrs.

No u can use any of the formulas and it is not the same because maybe you are rounding of the answers in the middle incorrectly which makes it not the same as they have given
Keep your answers in the middle to 4 significant number give only the final answer to 3 significant numbers
Your answers will be more accurate

 

[Adil0809]

No u can use any of the formulas and it is not the same because maybe you are rounding of the answers in the middle incorrectly which makes it not the same as they have given
Keep your answers in the middle to 4 significant number give only the final answer to 3 significant numbers
Your answers will be more accurate

Thank You Omar. Will try again!

 

[omaaaar]

Thank You Omar. Will try again!

U r welcome and ya try again and if the answer still doesn't come then tell me the question I will try too

 

[slisjunknown]

Even I dont get the answer in the ms

 

[omaaaar]

Even I dont get the answer in the ms

Could u tell me any particular question u tried whose answer u don't get I will see try to solve it to get the answer in ms

 

[MYLORD]

Could u tell me any particular question u tried whose answer u don't get I will see try to solve it to get the answer in ms

try to do oct.nov/2014/v21 and q 2) b ) part 1 and 2.....is there any general formula for finding uncertainties ?

 

[Marquez]

try to do oct.nov/2014/v21 and q 2) b ) part 1 and 2.....is there any general formula for finding uncertainties ?
View attachment 53650

I m sure u can use Pressure = Force/Area where Force = Weight = mg = 5.09*9.81
And Area is the cross-sectional area of the cylinder; Pi*(r^2) or [Pi*(d^2)]/4 in this case
n then let Uncertainty in Pressure = ΔP, Uncertainty in mass = Δm and Uncertainty in Diameter = Δd
Because Pi, 2 and g(9.81) are universal constants and not measurements we don't account for errors in them.
And for formulae involving 2 quantities being multiplied or divided, we find their fractional uncertainties and add them.

So,
ΔP/P = Δm/m + Δd/d
ΔP = (Δm/m + Δd/d)*P
Put in the values and Voila!! U r done. I hope it helped.