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Человек взялся за конец лежащего на земле однородного бревна массой 80 кг и длиной 2 м и поднял его так, что бревно оказалось наклоненным к земле под углом 45 градусов. Какую работу совершил при этом человек?
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Предмет:
Физика -
Автор:
jamyaherman - 6 лет назад
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Ответы 3
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Спасибо
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Автор:
dutchess35zt - 6 лет назад
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0
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на здоровье
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Автор:
slickt32j - 6 лет назад
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0
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человек поднял центр тяжести бревна на высоту h = L/2*sin(45)A=mgh=m*g* L/2*sin(45) =80*9,81* 2/2*КОРЕНЬ(2)/2 Дж = 554,9374 Дж ~ 555 Дж
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Автор:
terminator2hpq - 6 лет назад
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0
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Составьте пожалуйста 10 вопросов на английском по тексту:
George Washington was the first President of the USA.
He was horn on 22 February 1732 into the family of a rich Virginia landowner. In his early twenties, Washington took part in the war which the British Empire was fighting against France for the new territories in America. This was later called the French and Indian War. Washington fought bravely, but he didn't stay in the British army. He was very unhappy about how badly the American officers were being treated by the British generals.
in 1765 the British government decided to make the Americans pay taxes, but they forgot about the independent spirit of the colonists, whose ancestors had travelled across the ocean to find liberty and independence. Although the tax wasn't high and the colonists could afford to pay it easily, they were angry when they heard about the new law. The colonies were not even represented in the British Parliament, so nobody asked their opinion about the new taxes. The Americans then decided to boycott British goods. "No taxation without representation" were the words repeated by all the Americans.
So a war between Great Britain and its American colonies was about to start, but nobody could ever imagine that it would all begin over tea.
It happened in 1773 when British ships loaded with tea and guarded by warships came into Boston Harbour. The tea had to be unloaded and the tax on it had to be paid by midnight on December 16, 1773. The Bostonians decided that they were not going to accept the tea and were not going to pay the tax on it. At night, just before the deadline, the colonists dressed as Indians quietly climbed up into the ships. They opened the boxes of tea and emptied them all into the harbour. They called this the Boston Tea Party, and it becEime the first in a line of events that led America to separate finally from the British Empire.
At that time Washington, who had retired from the army, was enjoying a peaceful life as a landowner on his family's estate near Mount Vernon. But this peaceful life didn't last long because the Revolutionary War with Great Britain broke out soon after the Boston Tea Party. As a leader of Virginia's opposition to British colonial policies, Washington took an active part in the First and the Second Continental Congresses in 1774 and 1775-1776. At that time the Congress was a kind of American government which consisted of delegates from all of the thirteen colonies. The Second Congress chose Washington as head of the colonists' army. Washington found himself with a force of 14,000 badly trained men, who had no discipline and quickly lost their morale when things went wrong. But their leader didn't lose hope; he decided to train his army and took advice from more experienced generals. His efforts were not in vain; in 1781 America won a six-vear-long war and in 1783 peace with Great Britain was signed.
Although the victory made George Washington a national hero, he dreamed about getting back to his farm in Mount Vernon. However, his authority was badly needed again when the young country was faced with new problems after the war. The independent states disagreed on many questions, and wanted to have their own laws and make their own decisions. The Congress was so weak that it was ignored both at home and abroad. It was clear that America j needed a stronger central government.
In 1787 Congress asked each state to send delegates to a "constitutional convention" to discuss the situation. Washington presided over the convention, and the delegates worked out a completely new system of government. They called this system the Constitution of the United States. In 1789 when it came to choosing the head of state, everybody voted for Washington.
As the first President, Washington had to make a lot of important decisions for the first time. Washington set up a lot of political institutions, decided on where to have the American capital, which was given his name, and ordered the building of the White House, the home of all American presidents ever since. For all the great things that he did Americans call him "the Father of our Country".
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Предмет:
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Автор:
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