Предмет: Физика, автор: ankaor2012

птица массой 2кг летит со скоростью 2м/с на высоте 200м над поверхностью Земли. чему равна ее механическая энергия?

Ответы

Автор ответа: junk5552009
0
полная механическая энергия равна потенциальная + кинетическая, потенциальная = mgh кинетическая m*U^2/2 ; m=2*10^3 г  g=9,8 ; Ep=mgh=2*10^3*9.8*200=392*10^4 Дж ; Eк=m*U^2/2=2*10^3*4/2=4*10^3 Дж ; Вся энергия = Eк+Ep=392*10^4+4*10^3=3924*10^3 Дж
Автор ответа: ankaor2012
0
спасибо
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