- #1
Gian_ni
If rotational kinetic energy of a closed system decreases, another form of energy must increase for the conservation of energy of a closed system.
We assume this system (a person in rotation) has these forms of energy:
ΔE=ΔK (only rotational around an axis) + ΔUi (internal) + ΔEt (thermal) with ΔE=0, ΔK<0
The muscles make always an effort so also ΔUi<0. Then ΔEt>0 Is it right?
But if ΔK>0 the muscles make an effort ΔUi<0. ΔUi = -ΔK ( ΔEt=0 )
There is a contradiction in the first case so that ΔUi should be > 0 ?
Thank you
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We assume this system (a person in rotation) has these forms of energy:
ΔE=ΔK (only rotational around an axis) + ΔUi (internal) + ΔEt (thermal) with ΔE=0, ΔK<0
The muscles make always an effort so also ΔUi<0. Then ΔEt>0 Is it right?
But if ΔK>0 the muscles make an effort ΔUi<0. ΔUi = -ΔK ( ΔEt=0 )
There is a contradiction in the first case so that ΔUi should be > 0 ?
Thank you
[/SIZE]