Предмет: Физика, автор: KarenAnastasia

помогите решить
плот плывущий по реке , имеет площадь 8м2. После того как на него поместили груз, его осадка увеличилась на 20 см. каков вес помещенного на плот груза?

Ответы

Автор ответа: ужнеужели
101

Используем закон Архимеда, по которому выталкивающая сила равна весу вытесненной телом жидкости. То есть, вес груза и выталкивающая сила равны, следовательно, вес груза равен весу вытесненной плотом воды.

m=pV, где V- объем погрузившейся в воду части плота, p - удельная плотность воды р=1000 кг/м^3

V = S*h = 8 м^2 * 0.2 м = 1,6 м^3


Р = mg = p*V*g = 1000 кг/м^3 *1,6 м^3 * 10 м/с^2 = 16000 кг = 16 тонн

Похожие вопросы
Предмет: Английский язык, автор: ggbet3129321213
70.4 выберите правильную форму глагола A CLEVER BARMAN
The other day I (finish) work earlier than usual. The weather (be) fine, so I (decide) (take) a walk. While I (pass) one of the
numerous pubs, I (realize) that I not (have) anything to drink since morning and that I certainly (like) a pint of beer. “There (be) nothing better than cold beer on a hot day like this!” I (think) and (enter) the Golden Bar. I (see) men and women (sit) at their tables over a glass of beer. The beer (bring) soon, but as I not (be) in the bar before, I (take) a look around. Almost every seat (occupy). I watched people (talk) and (laugh). Finally I (finish) my beer and (be) about (leave) the bar when it (begin) (rain). I (wait) for ten minutes but the rain not (stop). The strange part of it was that there (be) no clouds in the sky and yet it (rain) hard. I (can) not possibly (go out) as I not (take) an umbrella with me. I (expect) the rain (stop) soon, so I (change) my mind and (order) a substantial lunch. I (notice) many people (do) the same, so the waiter (have) a lot of work to do. “It (rain) for an hour already, but the rain (show) no sign of stopping. It’s time I (leave),” I (think) and (go out). I (walk) a few steps in a hurry and then (stop) in surprise. There (be) no rain. All the time I (sit) in the bar, there (be) no rain at all!
But just a few yards away from the front door of the bar an elderly woman (sit) comfortably on a chair. She (hold) a hose1 linked to a tap. She (water) the pavement in front of the bar.
A clever man, that barman was! He (want) people (stay) in his bar as long as possible. And his trick (work) with me as well.
Предмет: Информатика, автор: SCRIMG59