6. A piece of cork has a mass of 550 grams. An 18 N sinker is attached to it. With only the sinker in water, the cork and sinker weigh 20.7 N, with the sinker and cork both in water, they weigh 0.9 N. When the sinker was immersed in alcohol, it weighed 15.7 N. Determine the density of the cork in kg/m³? What is the specific gravity and density of the sinker? Determine the density of the alcohol in gm/ml.
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
Given that, while the only sinker in water the weight of cork and sinker be defined as 20.7 N. And when both in water the net force is 0.9 N. Therefore the net force be given as,
The mass of the cork is given 550 grams, therefore the density of the cork be calculated as,
Given that, while only sinker in water the weight of cork and sinker be defined as 20.7 N
Therefore,
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