394. Для погружения в воду куска воска массой 4,9 г к нему привязали металлическую гайку, которая весит в воде 98 мН. Общий вес воска с гайкой в воде 78,4 мН. Найдите плотность воска.
The density of wax can be calculated using the mass and volume of the object. In this case, the mass of the wax is 4.9 grams. To find the volume, we need to first find the volume of the metal nut attached to the wax by using its weight in water, which is 98 millinewtons. Now, we can subtract the weight of just the wax (78.4 millinewtons) from the weight of the wax and nut together (98 millinewtons), which gives us the weight of the nut alone (19.6 millinewtons). From this, we can use the density formula (density = mass/volume) to find the volume of the nut and, subsequently, the volume of the wax. Once we have the volume of the wax, we can calculate its density by dividing the mass of the wax by its volume. And voila, we have found the density of the wax!
