Дано:
m = 5 килограмм - масса свободно падающего тела;
Eпотенциальная = 490 Джоулей - потенциальная энергия тела в начальный момент времени.
Требуется определить v (м/с) - скорость тела в момент удара о землю.
Согласно закона сохранения энергии, вся потенциальная энергия, которой обладало тело в начальный момент времени, перейдет в кинетическую в момент удара о землю:
Eпотенциальная = Eкинетическая;
Eпотенциальная = m * v^2 / 2
v = (2 * Eпотенциальная / m)^0,5 = (2 * 490 / 5)^0,5 = (980 / 5)^0,5 = 196^0,5 = 14 м/с.
ответ: в момент удара о землю тело будет обладать скоростью, равной 14 метров в секунду.
Объяснение:
ANA and answer in pairs What is the difference between weather report and a weather
Arecas
What is the weather like today? What was the weather like yesterday (last Sunday)/ two days ago?
Read Paul's letter to Taras and say what it is about.
Pan
Taras weather
Lesson
VOCABULARY BOX
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degree idon forecast ks1
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realme To
Subject
Hi. Taras,
Well, spring officially starts in March, summer in June, autumn in September and winter in December. But sometimes we have weather from each season all in one day. Because English weather changes so often, there is always something to talk about A remark to a stranger about the weather such as "Not a very nice day, is it?" can often lead to an interesting dialogue
Even poets talk about the weather. For example, the great poet Lord Byron (1788-1824) once said, "I like the weather, when it is not raining. That is, I like two months of every year."
Hidfind
SPERM
Internet
b) Answer the questions.
When does summer officially start and finish in Britain? Why do people in Britain talk about the weather a lot?
How can you start a talk with a stranger?
e Which months do you think the great poet Lord Byron liked best?
Cork (Wnd-1251)