Physics, 20.09.2020 01:01 priscillarios30

Автомобиль, двигаясь равномерно, проходит третью часть пути со скоростью 20 метров в час, а остальной путь - со скоростью 36 километров в час. Определите среднюю скорость на всём пути. ...пожалуйста помогите, поставлю 5 звёзд, зараннее спасибо...

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Answer from: ashliemallen

Ответ:

59,9334м / час

Пояснение:

Используя формулу Скорость = Расстояние / Время

Время = Расстояние / скорость

Если автомобиль использовал скорость 20м / час на первом этапе своего пути и преодолевает одну треть расстояния, общее время, затраченное автомобилем, составит;

Время = (д / 3) ÷ 20

Т1 = d / 3 × 1/20

T1 = d / 60 часов

Для второй части путешествия:

Если он использовал скорость 36 км / ч до конца пути

Расстояние = 1- d / 3 = 2d / 3

Скорость = 36000 м / час {1 км = 1000 м}

Время, затраченное на это путешествие = 2д / 3 ÷ 36000

Т2 = 2d / 3 × 1/36000

Т2 = 2d / 108000

T2 = d / 54000

Общее время, затраченное на всю поездку = d / 60 + d / 54000

Общее расстояние = d / 3 + 2d / 3

Общее расстояние = d

Средняя пройденная скорость за весь путь = d / (d / 60 + d / 54000)

= d / (900d + d) / 54000

= d / {901d / 54000}

= d × 54000 / 901d

= 54000/901

= 59,9334м / час

Отсюда средняя пройденная скорость за весь путь составляет 59,9334 м / час

Answer from: Quest

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by mathematical calculations before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of uranus led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

Answer from: Quest

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

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Автомобиль, двигаясь равномерно, проходит третью часть пути со скоростью 20 метров в час, а остально...

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