An empty 60 litre petrol tank has a mass of 10kg. Its mass when full of fuel of relative density 0.72 is
Answer Details
The mass of the tank when empty is 10 kg. The volume of the tank is given as 60 litres. When it is full of fuel of relative density 0.72, the mass of fuel it contains is equal to the volume of the fuel multiplied by its density, which is given by: Mass of fuel = Volume of fuel x Density of fuel Mass of fuel = 60 x 0.72 = 43.2 kg Therefore, the total mass of the tank when full of fuel is equal to the sum of the mass of the tank when empty and the mass of the fuel it contains, which is: Total mass = Mass of tank when empty + Mass of fuel Total mass = 10 kg + 43.2 kg = 53.2 kg Hence, the correct answer is 53.2kg.