You need a unit for the mass, not just a number. In any case, the idea is to divide the mass by the volume.
If you are given the volume [V] and density [p], the object`s mass [m] is given by the relation: m = p*V , where (*) indicates multiplication. Also, make sure that all units are in the same measurement system (Metric, Imperial, etc.) As an example, lets say I have a tank of water (p=1000 kg per m3 for water) that is 15m3 in volume. The mass of water in the tank is: m = (1000)*(15) kg = 15, 000 kg
If the object is fully immersed then density is (5)/(45-30) = 5/15 = 1/3 gm per mL (and since it is less than 1 the density of water, is it fully immersed without something holding it down?)
If the density is less than '1' , it will float. If the density is greater than '1' it will sink. Humans have a density of about 0.97 , so we float. Remember Archimedes Principle. 'The weight of a body immersed in a fluid is equal to the weight of the fluid displaced'.
How do you calculate the mass of an object that has a potential energy of 180 joules and rest at the top of a hill 15 meters from the ground?
It is impossible to give a sensible answer to this question. The mass of 15 ml of air will be very different from the mass of 15 ml of mercury. Furthermore, the weight of either will depend on the force of gravity acting upon them. In outer space they will weigh close to nothing while on the surface of a neutron star, they will weigh a huge amount!
You need to know the volume because the density is the ratio mass/volume.
Density = Mass/Volume = 15/60 = 0.25 grams per millilitre.
Mass = 15 gm Volume = 2 cubic cm Density = Mass/Volume = 15/2 = 7 and 1/2 or 7.5 g per cm3
Density is the quotient of the mass and the volume. 15 grams ÷ 5.0 mL = 3.0 g/mL
15 3x5=15
Density of that object is 2.8
The density is 15 g/mL
Density = about 1.66 g/mL
If you are given the volume [V] and density [p], the object`s mass [m] is given by the relation: m = p*V , where (*) indicates multiplication. Also, make sure that all units are in the same measurement system (Metric, Imperial, etc.) As an example, lets say I have a tank of water (p=1000 kg per m3 for water) that is 15m3 in volume. The mass of water in the tank is: m = (1000)*(15) kg = 15, 000 kg
The density is 45/15 = 3 grammes per cubic centimetre.
Density is just the mass divided by the volume, so 3 grams ÷ 6 mL = 0.5 g/mL
Density equal to mass over volume, so you would have to divide 15 over 5 equal to 3 grams per cubic cm