- #1

Esoremada

- 52

- 0

http://puu.sh/4IjIT.png [Broken]

I don't quite understand why this is correct. My initial try was this... (the only difference is at the end, bolded)

r = 0.154m

period = 0.426s

rev per second = 1/0.426s

w = 2*pi*(1/0.426)

mg = Fn*cosx

Fn = mg/cosx

Fc = Fn*sinx = mg/cosx

= mg*tanx

mg*tanx = mv^2/r

mg*tanx = m(r*

g*tanx = (r*

9.8*tan(x) = 0.154*

EDIT: So this way does work, why did the way in the screenshot get the same answer?

EDIT 2: Oh... I just did it wrong and coincidentally got a close enough answer to round to the right answer.

I don't quite understand why this is correct. My initial try was this... (the only difference is at the end, bolded)

r = 0.154m

period = 0.426s

rev per second = 1/0.426s

w = 2*pi*(1/0.426)

mg = Fn*cosx

Fn = mg/cosx

Fc = Fn*sinx = mg/cosx

= mg*tanx

mg*tanx = mv^2/r

mg*tanx = m(r*

**sinx**)w^2g*tanx = (r*

**sinx**)*w^29.8*tan(x) = 0.154*

**sinx***[2*pi*(1/0.426)]^2EDIT: So this way does work, why did the way in the screenshot get the same answer?

EDIT 2: Oh... I just did it wrong and coincidentally got a close enough answer to round to the right answer.

Last edited by a moderator: