15. для строительства плотины потребовалось 480000 м3 песка. сколько нужно было вагонов для перевозки этого песка, если в каждый вагон насыпают 18 т. плотность песка 1500 кг/м3. какую скорость приобретет покоящееся тело массой 200г под действием силы 4н,действующей на него в течение 0,2с? .определите наибольшую высоту бетонной колонны, которая может разрушиться под действием собственной силы тяжести, если допустимое давление бетона 5000кпа.
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Объяснение:
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