Lab Report 6 Help

delta L = sqrt((DeltaI/I)^2+(Deltaomega/omega)^2)*L

hello every,

did any one get Q14, I am having a very hard time with that
also, what are the S.I.Units in Q15

thanx

thank u super

heeyyyy

quick question

for #7

what numbers u use for (abs(alpha_fr)+alpha)

Unfortunately you need to do your graphs first. The #'s you need are the slopes of the graphs.

what are the S.I.Units in Q15

how do u find Error in #7
wat do u exactly multipy?

SI for 15 is kgm^2rad/s
To find the Delta I use (Deltar/r)*I

I was able to figure out the I but using the same method in question 7 could not get the error I, any suggestions???

anyone know how to get these? i got the values but dont know how to do the errors, i can help with all other questions.

i need help to find delta I disk, i know formula, but wat do u plug in exaclty?

and wat is the I_disk that u have to multiply at end?

hey so does anyone know what to do for question 16. I can't remember how to do it at all. any help please? I feel like this quesiton was asked in the last lab and i had a hard time figuring it out then. thanks!!!

Im having trouble calculating I for the system with the large weight on it.. question 11. i understand howto find deltaI..but cant get that without a value for I.. should I be using the same equation as before? I= (m*r*g)/(alphafr-alpha)? I used this equation and it came out wrong.. are the values of alphafr&alpha the same throughout the lab?

Also- whats the equation for finding L? (question 16)

thanks!

16
from question 15 take the
abs(Lbefore-Lafter) and divide it by
sqrt(DeltaLbefore^2+DeltaLbefore^2)

I think i understand how to get the ratio in question 16.. but i dont understand how weget thevalues for L and delta L, Lprime & deltaLprime..

& im having a problem with question 11 too what is the equation we use to get the combined moment of inertia Iprime?

how do u figure out the I of the disk wouldnt it be the same as for 7? but thats not working

what are the untis of L does any one know???

L = angular momentum before disk is dropped
deltaL = error of angular momentum before disk is dropped
L' = angular momentum after disk is dropped
deltaL' = error of angular momentum after disk is dropped

I' = I + I_disk

I_disk = .5*M*R²

L = I*omega; units for I = kg*m², units for omega = rad/s.
L = [kg*m²*rad/s]

Units for L > kgm^2rad/s

For # 7: I=mr(g-ra)/abs(alpha_fr)+alpha ; deltaI=deltar/r*I

For # 11: I'= I+I_disk ; deltaI'= sqrt((deltaI)^2+(deltaI_disk)^2)

For #15: L=I*w ; deltaL=sqrt((deltaI/I)^2+(deltaw/w)^2)*L

Hopefully, that helps

quick question

what does deltar/r equal too

how to solve deltar/r ?

i got it

i was confused

Just to clarify, for graph 1: the angular velocity is on the y axis and the time on the x axis, right? Becuase when I try to find slope, the only answer that I can put in for MapleTA is a negatve one, and clearly my slope is increasing

Then something is wrong. For Graph 1 the slope should be negative. The graph itself is a negative linear slope.

how do i get L before for Q15....i keep getting it wrong when i do L=Iw is there another way of doing it

You need to calculate L and L' which is really just the angular acceleration before (L) and after (L') the disk is dropped.

To calculate L take the I from Question 7 and multiply it by omega in Question 13. L' should be the combined Inertia (I') from Question 11 multiplied by omega' in Question 13.

Try those.