An object has a weight of 21 N in air and an apparent weight of 5.1 N when submerged in water. What is its density?
To find the density of the object, we can use the formula:
Density = (Weight in air) / (Weight in air - Weight in water)
Weight in air = 21 N
Weight in water = 5.1 N
Density = 21 N / (21 N - 5.1 N)
Density = 21 N / 15.9 N
Density = 1.32 kg/m^3
Therefore, the density of the object is 1.32 kg/m^3.