Свічка розміщена на відстані 15 см від розсіювальної лінзи. на якій відстані від лінзи можна отримати зображення свічки якщо фокусна відстань лінзи 0,3 м

👇

Ответ:

Кate1257

09.01.2023

Линза рассеивающая - фокус мнимый(-F)
изображение мнимое (-f)
формула тонкой линзы
$\frac{1}{-F} = \frac{1}{d} + \frac{1}{-f}$
$\frac{1}{f} = \frac{1}{d} +\frac{1}{F}$
$\frac{1}{f} = \frac{1}{0.15} + \frac{1}{0.3} = \frac{2+1}{0.3} = \frac{3}{0.3} =10$
$f= \frac{1}{10} =0.1m$ с той же стороны, что и предмет
изображение мнимое ,прямое , уменьшенное

4,7(92 оценок)

Открыть все ответы

Ответ:

NikichRUS25

09.01.2023

Дано:

g = 10м/с² - ускорение свободного падения

Vo = 40м/c - начальная скорость

t1 = 2c

t2 = 5c

Найти:

V1 и V2 - соответствующие скорости тела, u2 - перемещение тела,

S2 - пройденный путь

Вертикальная координата х тела равна

х = Vot - 0,5gt²

или

х = 40t - 0,5·10t²

Исследуем эту функцию, найдём её нули

40t - 5t² = 0

5t(8 - t) = 0

t = 0, t = 8

Итак, через 8с тело упадёт на землю.

Через 4с оно достигнет высшей точки

Найдём координату х высшей точки

хmax = 40·4 - 0,5·10·16 = 80м

Скорость

V = Vo-gt

V1 = 40 - 10·2 = 20м/с (знак "+" показывает, что скорость направлена верх)

V2 = 40 - 10·5 = -10м/с (знак "-"показывает, что скорость направлена вниз)

координата тела через 5с

x2 = 40·5 - 0,5·10·25 = 75м

Перемещение тела u = х2 = 75м

После достижения высшей точки (хmax = 80м) тело пролетело вниз ещё 80 - 75 = 5м.

Путь тела S2 = 80 + 5 = 85м

4,4(48 оценок)

Ответ:

ррррр84

09.01.2023

Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00don't you say something Just try to do it I'll come to you at 3.00don't you say something Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00don't you say something Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00Just try to do it I'll come to you at 3.00