Question la
A cube of side 0.040 m is floating in a container of liquid. Fig. 3.1 shows that the surface of the liquid is 0.028 m above the
level of the bottom face of the cube.
air
0.040 m
cube
0.028 m
liquid
valve
pump
Fig. 3.1
The pressure of the air above the cube exerts a force on the top face of the cube. The valve is closed.
Explain, in terms of air molecules, how the force due to the pressure of the air is produced.
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