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 the wax can be calculated by using the following formula: density = mass / volume. In this case, we know that the mass of the wax is 4.9 grams. To find the volume, we can subtract the weight of the wax and the bolt in air (98 mN) from the weight in water (78.4 mN). This gives us a weight difference of 19.6 mN. Now, using the density formula, we can plug in the known values and solve for the volume. The result will be in cubic meters, so we can convert it to cubic centimeters by multiplying by 1000000. Finally, dividing the mass by the volume will give us the density of the wax in grams per cubic centimeter. This is your solution.
