A 4-kg plastic tank that has a volume of 0.18 m3 is filled with liquid water. Assuming the density of water is 1000 kg/m3, determine the weight of the combined system.

Explanation:

In this problem we are expected to find the weight of the plastic tank and the weight of the equal volume of water

Given that

density of water = 1000 kg/m^3

volume of plastic tank is same as the volume of water= 0.18 m^3

we need to solve for the mass of the water

we know that density is = mass/volume

1000= mass/0.18

mass= 1000*0.18

mass= 180 kg

the total mass of the combined system is

4+180= 184 kg

the weight = mg (assuming g= 9.81 m/s^2)

weight = 184*9.81

weight= 1805.04 N

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