Подъёмный кран равномерно поднимает груз массой 1000 кг за 30 с. мощность подъёмного крана 10 квт. найдите а) механическую работу, совершаемую силой троса подъёмного крана; б) высоту, на которую поднимается груз

1) N = A / t > A = N * t 

N - мощность ( 10 кВт = 10000 Вт ) 
t - время ( 30 с ) 

A = 10000 * 30 = 300000 Дж 

2) E = m * g * h > h = E / m * g 

m - масса ( 1000 кг ) 
E - энергия ( 300000 Дж ) 
g - ускорение свободного падения ( 10 Н / кг ) 

h = 300000 / 1000 * 10 = 300000 / 10000 = 30 м ответ: 300000 Дж ;30 м 

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Вариант 1                                                                                                                                                                                                           1)А. по рассеянию α-частиц                                                                                                                     2)Г. электромагнитные волны большой частоты                                                                                     3) Б. 7 электронов                                                                                                                               4)82 протона, 132 нейтрона                                                                                                                      5) А.                                                                                                                                                                 6)а                                                                                                                                                                     7) Б. уменьшается на 2 единицы                                                                                                                      8) Г. не изменяется    

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