Wednesday

April 16, 2014

April 16, 2014

Posted by **chelsea** on Wednesday, May 30, 2012 at 8:31pm.

- physics -
**Elena**, Thursday, May 31, 2012 at 8:11amThe moment of inertia of the rectangular plate about its side is

I =ma²/3 , where a is the length of another side (perpendicular to the axis of rotation), therefore,

I1 =m(0.46)²/3,

I2 =m(0.09)²/3,

Final angular velocity is

ω = ε1t1, ε1 =ω /t1

ω = ε2t2, ε2 =ω /t2

The Newtons 2 Law for rotation

M=Iε,

M=I1 ε1 = I1 ω /t1= m(0.46)² ω /3t1,

M=I2 ε2= I2 ω /t2 = m(0.09)² ω /3t2,

m(0.46)² ω /3t1 = m(0.09)² ω /3t2,

(0.46)² /t1 =(0.09)² /t2,

t2 =t1 (0.09/0.46)² = 7.53.810^-2= 0.28 s.

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