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Консультация № 136508
12.05.2008, 17:29
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Помогите пожалуйста!!!!
По небольшому куску мягкого железа, лежащему на наковальне массой m1=300 кг, ударяет молот массой m2=8 кг. Определить КПД удара, если удар неупругий. Полезной считать энергию, затраченную на деформацию куска железа.
По небольшому куску мягкого железа, лежащему на наковальне массой m1=300 кг, ударяет молот массой m2=8 кг. Определить КПД удара, если удар неупругий. Полезной считать энергию, затраченную на деформацию куска железа.
Обсуждение
12.05.2008, 18:30
общий
это ответ
Здравствуйте, Бондаренко Ольга Ивановна!
Пусть скорость молота v
тогда его кинетическая энергия m2*v^2/2=4*v^2
а импульс m2*v=8v
так как импульс сохраняется, в момент удара скорость системы становится
v2=m2*v/(m1+m2)=8/308*v
оставшаяся кинетическая энергия (m1+m2)*v2^2/2=32/308*v^2
полезная работа A=(4-32/308)*v^2=1200/308*v^2
кпд=(1200/308*v^2)/(4*v^2)=97.4%
Пусть скорость молота v
тогда его кинетическая энергия m2*v^2/2=4*v^2
а импульс m2*v=8v
так как импульс сохраняется, в момент удара скорость системы становится
v2=m2*v/(m1+m2)=8/308*v
оставшаяся кинетическая энергия (m1+m2)*v2^2/2=32/308*v^2
полезная работа A=(4-32/308)*v^2=1200/308*v^2
кпд=(1200/308*v^2)/(4*v^2)=97.4%
Форма ответа
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