Предмет: Физика, автор: kghvkgghr

Три коробочки, массы которых 25 г, 35 г и 40 г, расставлены так, как показано на рисунке.
Первая коробочка находится на полке, расположенной на высоте 0,4 м над столом.
Вторая коробочка лежит на столе, высота которого от пола — 1 м. Третья коробочка стоит на полу.
Какова потенциальная энергия каждой коробочки относительно поверхности стола?

Ответы

Автор ответа: ivashchenko322123
7

Ответ:

Объяснение:

E pot = mgh , где m — масса тела, а g — ускорение свободного падения у поверхности Земли

Первой - 0,025*0,4*9,8=0,098 дж

Второй - 0,035*1*9,8=0,343 дж

Третьей - 0,04*0*9.8=0 дж

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Families have great-great future
In the future great-grandparents and even great-great-grandparents may meet at many family events and reunions, while cousins, aunts and uncles may become 'a thing of the past', say researchers at Oxford University.
The study shows that birth rates are falling and life expectancy is increasing which means that British families will get longer but thinner. 'What we are seeing is the start of the 'beanpole' family where the number of uncles, aunts and cousins is decreasing,' says Dr Sarah Harper, the study's author. 'At the same time, increasing life expectancy means many more of us will live long enough to become great-grandparents.'
The changing shape of the family will bring new difficulties and advantages. Fewer uncles, aunts and cousins will mean that parents have less opportunity to share the stress of childcare with
other adults, and children will have less opportunity to socialize with other children. However, having grandparents and great-grandparents could lead to a better understanding between generations.
Recent changes in birth rates and life expectancy mean that women today have an average of 1.64 children compared with 2.93 forty years ago, while average life expectancy has increased by 10 years in the past 50 years, to 80 for women and 75 for men.
Family dinners with five generations at the table are a reality for the Woodgates from Exeter, in England. May Pearce, 87, enjoys spending time with her great-great-granddaughter, Ellie Lou, 3. Ellie Lou's grandmother, Denise Woodgate, 39, said, 'Having so many generations in a family is wonderful. We're very close. At least once a week we all go out for a coffee.