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March 31, 2015

March 31, 2015

Posted by **Lauren** on Thursday, July 5, 2012 at 11:33pm.

Find the rotational inertia of the entire door.

If it's rotating at one revolution every 10.5 , what's the door's kinetic energy?

- Physics -
**Elena**, Friday, July 6, 2012 at 3:15pmThe moment of inertia (rotational inertia) of the rectangular plate about the axis passing along the axis is

Iₒ=ma²/3, where a= 1.5 m.

Moment of inertia of the whole door is I=4Iₒ=4ma²/3 =4•39.5•1.5²/3=117.9 kg•m².

f=1/10.5=0.095 Hz

KE=Iω²/2=I(2πf)²/2=

=117.9•(2•π•0.095)²/2=21.1 J

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