Какую массу древесного угля надо сжечь, чтобы получилось такое количество теплоты, какое выделяется при сгорании 2 кг каменного угля?(1,6 кг)​

1. Какая часть объема плавающего тела погружена в жидкость, если плотность тела в 3 раза меньше плотности жидкости?

1/3 часть объёма.

2. В каком случае на плавающую пробку действует бОльшая сила Архимеда - когда пробка плавает в воде или когда она плавает в керосине?

думаю на плавающий предмет действует одинаковая сила в любой жидкости и она равна весу предмета.

3. Чем объясняются огромные размеры воздушных шаров?

маленькой выталкивающей силой в газах

4. Почему воздушный шар надо заполнять газом, плотность которого меньше плотности окружающего воздуха?

чтобы создать подьёмную силу, которая равна разности между выталкивающей силой и весом шара

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