PHYS1171 Lecture Notes - Lecture 9: Net Force, The Fluid, Blood Pressure

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olivemosquito726

20 Jul 2018

School

Department

Physics

Course

PHYS1171

Professor

Marissa

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Document Summary

Floating: an object floating on the surface (technically, partially submerged) is not accelerating and thus must have no net force acting on it. Quiz: the buoyant force is due to the pressure variations in the fluid. False: the buoyant force changes with the mass of the object in the fluid. False: objects made of a material with a density greater than the density of the fluid cannot float. We"ll be considering flow through a pipe or tube in this module. We may make a number of simplifying assumptions in deriving equations. Continuity: continuity is the conservation of mass, as the flow is steady, the same amount of mass must flow pass each and every point in the pipe in any given time interval. If less mass were to flow past one point compared to another, then the fluid would bank up and it would no longer be steady.

Related Questions

Archimedes’ Principle states that the buoyant force on an object partially or fully submerged in a fluid is equal to the weight of the fluid that the object displaces. Thus, for an object of density floating partly submerged in a fluid of density , the buoyant force is given by,

where 'g' is the acceleration due to gravity and is the area of a typical cross-section of the object (see the figure). The weight of the object is given by

Show that the percentage of the volume of the object above the surface of the liquid is

$A (y)$

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where g is the acceleration due to gravity and A(y) is the area of a typical cross-section of the object. The weight of the object is given by,

Show that the percentage of the volume of the object above the surface of the liquid is

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Archimedes’ Principle states that the buoyant force on an object partially or fully submerged in a fluid is equal to the weight of the fluid that the object displaces. Thus, for an object of density ρ0ρ0 floating partly submerged in a fluid of density ρfρf, the buoyant force is given by

where g is the acceleration due to gravity and A(y) is the area of a typical cross-section of the object (see the figure). The weight of the object is given by

(a) Show that the percentage of the volume of the object above the surface of the liquid is .

(b) The density of ice is and the density of seawater is . What percentage of the volume of an iceberg is above water?

(d) A sphere of radius and having negligible weight is floating in a large freshwater lake. How much work is required to completely submerge the sphere? The density of the water is .