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Welcome to PHY 121 Blog Help. Here's how it works. For each homework question and lab report we will make a post, this will probably contain a few tips on what the problems are about and how to solve them. If you are stuck on something then instead of emailing us directly you should post a comment in reply to the relevant post. We will try to guide you through tough points and help you understand the problems and the concepts behind them.
14 comments:
i cant seem to get the second to last part where it says to use equation 1.6 "The other term involved in determing in the error in the kinetic energy is the error in the sum of the masses and . Equation 1.6 of Lab 1 tells us that (use DeltaM for and Deltam for )"
i wrote down many formulas the one i thought was right goes something like this if anybody can help me out on this
sqrt((DeltaM)^2+(Deltam)^2)
i don't know if its wrong or if my expression is written wrong
I have exactly the same problem, I know its correct
The lab prep quiz asks for the uncertainty on the quantity
Delta(M+m)
------------ (1)
(M+m)
but Eqn 1.6 from lab 1 gives the uncertainty on
Delta(M+m).
Don't forget to account for the denominator in (1) above when answering the lab 4 prep questions.
right and i have taken that into effect and answered the question before and that answer is not accepted either therefore i began to think maybe it was the wrong expression
this is what i had originally and it was incorrect.
(sqrt(((DeltaM)/M)^2+((Deltam)/m)^2))(M+m)
sorry corection (sqrt((DeltaM)^2+(Deltam)^2))*(M+m)
then shouldnt we be using equation 1.7 then?
(sqrt((DeltaM)^2+(Deltam)^2))/(M+m)
ive been using this formula and it keeps on saying its wrong i dont know what i need to fix in this equation
Instead of (DeltaM)^2, try DeltaM^2. Sometimes these programs are surprisingly fussy about syntax
i have tried numerous different answers even those which i knew were wrong and nothing is giving me the correct answer for example i used your advice and put these two answers in and the thing didnt accept it...
(sqrt(DeltaM^2+Deltam^2)(M+m)
(sqrt(DeltaM^2+Deltam^2)/(M+m)
is it possible the program is wrong or our answer is wrong?
It took me many tries, but finally this worked... sqrt(DeltaM^2+Deltam^2)/(M+m)
thanks a lot, ive been trying all possibilities, but for some reason that worked
The post from Oct 10, 9:23 has an extra unneeded parenthesis at the beginning. (Like energy and momentum, parentheses must be conserved.) The 10:10 PM post does have the correct form.
what am i doing wrong? According to 1.8 = abs(n) x Deltad^2/Deltad
According to 1.8 you multiply Deltad/d by the absolute value of n, which is 2 in this case.
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