# Lab Quiz 6

Page 2 of 2 ## question 3

tofuuu thank youuu!! tofu lov
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## ques 2

what is the disk constant used for ques 2?

guest23
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## q2

I'm having trouble with #2. i did .5 (m)(r^2) am I missing something.

nerda
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## q2

Need help with question 2 plzz this is what I used
.5*m*r^2

Fisica
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## q2

Just make sure the radius is in meters and the mass is in kg. and do .5*m*r^2 ...if that doesnt work again post your question

k
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## Re: Lab Quiz 6

why we use I=mg/(alpha fric+alpha) instead of the given formular I=mr(g-ra)/(afr+a)??

student
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## Re: Lab Quiz 6

I'm almost positive my calculations are correct, but Maple keeps saying it's wrong, here are my numbers and calculations:
mass = .2 kg
radius = 2.5 cm = .025 m
% = 1.25
a = 0.268
af = -0.177

so

(1.25/100)*.025 = 0.0003125

(.2*9.81)/(|-.177|+.268)
1.962/.445
= 4.4089888

4.4089888*0.0003125
= 0.001377809

## Re: Lab Quiz 6

Okay I know those calculations are correct but for some reason Maple TA did not like it. I took it again and it worked.

## question 3

this is the exact thing i did and got it right.

I = mr(g-(radius*a)) /(|afric|+a) .... the absolute sign in the denominator is a must dont forget it and dont forget to convert the radius to meters.

then simply divide your % for radius by 100.

then multiply that by what youu got for I.

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## Re: Lab Quiz 6 