A raft has dimensions 7.0 m x 7.0 m with a thickness of 1.0 m and made of material with average density 650 kg/m3. a. When floating in water, what percentage of the volume is under water? b. What is the pressure underneath the raft? c. How heavy of a load is necessary to cause the raft to be 80% submerged in water? d. If the raft is made with a different material of lower density and 80% of it is still submerged, how if at all would your answers to (a), (b) and (c) change? e. , explain how, if at all, the answer to (b) is related to the buoyant force. f. Imagine that the load increases enough to fully submerge and then sinks the raft to the bottom of the lake. How, if at all, does the buoyant force vary during this process?
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.
A raft has dimensions 7.0 m x 7.0 m with a thickness of 1.0 m and made of material with average density 650 kg/m3.
a. When floating in water, what percentage of the volume is under water?
b. What is the pressure underneath the raft?
c. How heavy of a load is necessary to cause the raft to be 80% submerged in water?
d. If the raft is made with a different material of lower density and 80% of it is still submerged, how if at all would your answers to (a), (b) and (c) change?
e. , explain how, if at all, the answer to (b) is related to the buoyant force.
f. Imagine that the load increases enough to fully submerge and then sinks the raft to the bottom of the lake. How, if at all, does the buoyant force vary during this process?
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