Concept explainers
The physical reason for the buoyant force in terms of pressure.
Answer to Problem 1ASA
The change in pressure between the top and bottom surface of a block in fluid is the buoyant force.
Explanation of Solution
When the object is placed in a fluid either it floats or sinks. The heavy object sinks in fluid and the lighter objects floats. The key parameters to study the forces on the object in a fluid are density and volume of fluid displaced.
The variation in the pressure between the surfaces of an object due to the change in height causes buoyant force. For submerged or floating bodies the pressure at the bottom of an object is not the same as the pressure.
The change in pressure between the top and bottom surface of a block in fluid is the buoyant force.
Conclusion:
Therefore, the change in pressure between the top and bottom surface of a block in fluid is the buoyant force.
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Chapter 21 Solutions
Physics Laboratory Experiments
- What fraction of an iron anchor's weight will be supported by buoyant force when submerged in saltwater?arrow_forwardWill the same ship float higher in salt water than in freshwater? Explain your answer.arrow_forwardRank the buoyant forces exerted on the following five objects of equal volume from the largest to the smallest. Assume the objects have been dropped into a swimming pool and allowed to come to mechanical equilibrium. If any buoyant forces are equal, state that in your ranking. (a) a block of solid oak (b) an aluminum block (c) a beach ball made of thin plastic and inflated with air (d) an iron block (e) a thin-walled, sealed bottle of waterarrow_forward
- Verify that pressure has units of enery per unit volume.arrow_forwardWhy does atmospheric pressure decrease more rapidly than linearly with altitude?arrow_forwardThe density of lead is greater than iron, and both metals are denser than water. Is the buoyant force on a solid lead object (a) greater than, (b) equal to, or (c) less than the buoyant force acting on a solid iron object of the same dimensions?arrow_forward
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- Calculate the buoyant force a 200-L helium balloon. (b) Given mass of rubber balloon is 1.50 g, what net vertical force the balloon if it is let go? Neglect the volume of be rubber.arrow_forwardFind the gauge and absolute pressures in the balloon and peanut jar shown in Figure 11.16, assuming the manometer connected to the balloon uses water whereas the manometer connected to the jar contains mercury. Express in units of centimeters of water for the balloon and millimeters of mercury for the jar, taking h=0.0500 m for each. Figure 11.16 An open-tube manometer has one side open to the atmosphere. (a) Fluid depth must be the same on both sides, or the pressure each side exerts at the bottom will be unequal and there will be flow from the deeper side. (b) A positive gauge pressure Pg=hg transmitted to one side of the manometer can support a column of fluid of height h. (c) Similarly, atmospheric pressure is greater than a negative gauge pressure Pg by an amount hg .The jar's rigidity prevents atmospheric pressure from being transmitted to the peanuts.arrow_forwardA man has a mass of 80 kg and a density of 955kg/m3 (excluding the air in his lungs). (a) Calculate his volume. (b) Find the buoyant force air exerts on him. (c) What the ratio of the buoyant force to his weight?arrow_forward
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