по наклонной плоскости длиной 5м и высотой 1,5 м поднимают груз 15 кг сила трения груза о балку 150 Н. какова полезная и полная работы при подъёме груза и КПД наклонной плоскости?

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Ответ:

кгшкванек1991

06.08.2022

все объяснение на фото,удачи!!

по наклонной плоскости длиной 5м и высотой 1,5 м поднимают груз 15 кг сила трения груза о балку 150

4,6(90 оценок)

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Ответ:

Marcelyn

06.08.2022

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4,6(70 оценок)

Ответ:

nosanchuk14

06.08.2022

• изначально шарик на высоте 3R обладал только потенциальной энергией. затем, достигнув верхнего конца мертвой петли, шарик стал обладать кинетической энергией и потенциальной 2R. запишем закон сохранения энергии

3 mgR = (m v²)/2 + 2 mgR,

mgR = (m v²)/2,

v² = 2 gR.

• запишем уравнение динамики для шарика в верхней точке мертвой петли

N + mg = ma,

N = m (a - g),

N = m ((2gR)/R - g),

N = mg = 1 H

○ так как сила нормальной реакции опоры равна по 3 закону Ньютона силе нормального давления (весу), то N = P = 1 H
Шарик соскальзывает без трения с верхнего конца наклонного желоба, переходящего в мертвую петлю ра