Re: Lab Report 6 Help

he on Wed Nov 12, 2008 10:35 pm

i got it

i was confused

Confuzzl on Thu Nov 13, 2008 1:14 pm

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

Guest01 · Guest01 on Thu Nov 13, 2008 5:25 pm

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

xxcutiex on Thu Nov 13, 2008 10:44 pm

how do i get L before for Q15....i keep getting it wrong when i do L=Iw Neutral

is there another way of doing it

Guest01 · Guest01 on Thu Nov 13, 2008 11:26 pm

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.

please on Fri Nov 14, 2008 12:03 am

How do you calculate the afric value? Do we just draw the min and max lines on the graph and then find the slope from there and thats the afric value?

xxcutiex on Fri Nov 14, 2008 12:14 am

thank youu soooo much that helped Razz

Guest01 · Guest01 on Fri Nov 14, 2008 4:14 am

a_fric value is the slope from your first graph

helllppp on Fri Nov 14, 2008 5:08 pm

In the formula for DeltaL, which I and DeltaI are we using exactly? i've tried all of them and none of them seem to be right.

helllppp on Fri Nov 14, 2008 5:13 pm

ooo never mind. i got it

confused on Fri Nov 14, 2008 5:29 pm

any one know the syntax for 14?? its driving me up the wall, and the rest of my lab is done...trade info?

DJ on Fri Nov 14, 2008 7:21 pm

Number 14 was mentioned on page two. It is:

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

Yeaaaa on Fri Nov 14, 2008 8:24 pm

Can someone help me with #9? I'm having trouble getting the Error of the IDisk. I got IDisk, and everything else on the page. But then I do sqrt ((deltaM/M)^2 + (deltaR/R)^2) x I and that's not getting me the right answer.

Guest01 · Guest01 on Sat Nov 15, 2008 1:20 am

Try in the calculations ...((2*deltaR)/R)²...

Kathleen on Sat Nov 15, 2008 1:08 pm

Question 7, the Moment of Inertia keeps getting marked wrong for me for some reason, and its messing up my answers to the other questions.

I used the equation I = mr(g-r*alpha)/(|afric|+alpha)
Where m = i used the mass of the suspended mass from ques 4 = .2 kg
r = radius of small cylinder = .02445 m
g = 9.81
alpha = slope from ques 5 = .3000
afric from question 2 = -.105714

.2*.02445(9.81-(.02445*.3))/(.105714+.300)
I = .11815

But that gets marked wrong. Any suggestions?

Lab Report 6 Help