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Камень массой 400 г брошенный вертикально вверх со скоростью 25 метров в секунду. на какой высоте его кинетическая энергия будет равна 2/3 потенциальной? Срочно! Плиииззз!!!
Ответы 1
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Ек=2Еп/3mV^2/2=Ek+Eп=2Еп/3+Еп=5Еп/3mV^2/2=5mgh/3V^2/2=5gh/3h=3V^2/10g=3*25^2/10*9.8=18,75 [м]
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Автор:
zaniyahrichmond - 6 лет назад
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In almost every respect the Chinese were at the forefront of developing the printed world.
In 105 A.D.,Ts'ai Lun invented the process for manufacturing paper,introducing the (A10)_______ use in China.The paper(A11)_______ superior in quality to the baked clay,papyrus and parchment used in ofter parts of the world.
By 593 A.D.,the first printing press(A12)______ in China,and the first printed newspaper was available in Beiging in 700 A.D.It was a woodblock printing.The Dinamond Star,the (A13)______ knovn complete woodboock printed book with illustartions was printed in China in 868 A.D.The Chinese world,it is(A14)______to the tehnology that German printed Johann Gutenberg used in the 1450s to produce his famours(A15)_____ of the Bidle.In 1155 A.D.,Liu Ching produces first printed map in China.
The impact these(A16)______had on the educational,political and literary development of the world is simply incalculable.
A10 1)firstly 2)one 3)first 4)ones
A11 1)was 2)is 3)has been 4)will be
A12 1)invented 2)was invented 3)is invented 4)has been invented
A13 1)early 2)earlier 3)earliest 4)more early
A14 1)same 2)like 3)related 4)analogous
A15 1)books 2)editions 3)copies 4)text
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