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Exercícios de fluidos · Physics Playground

ExercíciosFísica

Fluidos

24 problemas com soluções resolvidas, de College Physics.

Começar por um aleatório

Aprenda antes: Pressão e Profundidade, Flutuar e Afundar, Escoamento e Bernoulli

College Physics11.2 Density

Exemplo 11.1Calculating the Mass of a Reservoir From Its VolumeA reservoir has a surface area of 50.0km^2 and an average depth of 40.0 m. What mass of water is held behind the dam? (See Figure 11.5 for a view of a large reservoir—the Three Gorges Dam site on the Yangtze River in…

College Physics11.3 Pressure

Exemplo 11.2Calculating Force Exerted by the Air: What Force Does a Pressure Exert?An astronaut is working outside the International Space Station where the atmospheric pressure is essentially zero. The pressure gauge on her air tank reads 6.90×10^6Pa. What force does the air inside the tank exert…

College Physics11.4 Variation of Pressure with Depth in a Fluid

Exemplo 11.3Calculating the Average Pressure and Force Exerted: What Force Must a Dam Withstand?In Example 11.1, we calculated the mass of water in a large reservoir. We will now consider the pressure and force acting on the dam retaining water. (See Figure 11.10.) The dam is 500 m wide, and the water is 80.0 m…
Exemplo 11.4Calculating Average Density: How Dense Is the Air?Calculate the average density of the atmosphere, given that it extends to an altitude of 120 km. Compare this density with that of air listed in Table 11.1.
Exemplo 11.5Calculating Depth Below the Surface of Water: What Depth of Water Creates the Same Pressure as the Entire Atmosphere?Calculate the depth below the surface of water at which the pressure due to the weight of the water equals 1.00 atm.

College Physics11.5 Pascal’s Principle

Exemplo 11.6Calculating Force of Wheel Cylinders: Pascal Puts on the BrakesConsider the automobile hydraulic system shown in Figure 11.13. Figure 11.13 Hydraulic brakes use Pascal’s principle. The driver exerts a force of 100 N on the brake pedal. This force is increased by the simple lever…Com figura

College Physics11.6 Gauge Pressure, Absolute Pressure, and Pressure Measurement

Exemplo 11.7Calculating Height of IV Bag: Blood Pressure and Intravenous InfusionsIntravenous infusions are usually made with the help of the gravitational force. Assuming that the density of the fluid being administered is 1.00 g/ml, at what height should the IV bag be placed above the entry…

College Physics11.7 Archimedes’ Principle

Exemplo 11.8Calculating buoyant force: dependency on shape(a) Calculate the buoyant force on 10,000 metric tons (1.00×10^7kg) of solid steel completely submerged in water, and compare this with the steel’s weight. (b) What is the maximum buoyant force that water could exert…
Exemplo 11.9Calculating Average Density: Floating WomanSuppose a 60.0-kg woman floats in freshwater with 97.0% of her volume submerged when her lungs are full of air. What is her average density?
Exemplo 11.10Calculating Density: Is the Coin Authentic?The mass of an ancient Greek coin is determined in air to be 8.630 g. When the coin is submerged in water as shown in Figure 11.24, its apparent mass is 7.800 g. Calculate its density, given that water has a density…

College Physics11.8 Cohesion and Adhesion in Liquids: Surface Tension and Capillary Action

Exemplo 11.11Surface Tension: Pressure Inside a BubbleCalculate the gauge pressure inside a soap bubble 2.00×10^(−4)m in radius using the surface tension for soapy water in Table 11.3. Convert this pressure to mm Hg.
Exemplo 11.12Calculating Radius of a Capillary Tube: Capillary Action: Tree SapCan capillary action be solely responsible for sap rising in trees? To answer this question, calculate the radius of a capillary tube that would raise sap 100 m to the top of a giant redwood, assuming that sap’s…

College Physics11.9 Pressures in the Body

Exemplo 11.13Calculating Gauge Pressure and Depth: Damage to the EardrumSuppose a 3.00-N force can rupture an eardrum. (a) If the eardrum has an area of 1.00cm^2, calculate the maximum tolerable gauge pressure on the eardrum in newtons per meter squared and convert it to millimeters of…

College Physics12.1 Flow Rate and Its Relation to Velocity

Exemplo 12.1Calculating Volume from Flow Rate: The Heart Pumps a Lot of Blood in a LifetimeHow many cubic meters of blood does the heart pump in a 75-year lifetime, assuming the average flow rate is 5.00 L/min?
Exemplo 12.2Calculating Fluid Speed: Speed Increases When a Tube NarrowsA nozzle with a radius of 0.250 cm is attached to a garden hose with a radius of 0.900 cm. The flow rate through hose and nozzle is 0.500 L/s. Calculate the speed of the water (a) in the hose and (b) in the nozzle.
Exemplo 12.3Calculating Flow Speed and Vessel Diameter: Branching in the Cardiovascular SystemThe aorta is the principal blood vessel through which blood leaves the heart in order to circulate around the body. (a) Calculate the average speed of the blood in the aorta if the flow rate is 5.0 L/min. The aorta…

College Physics12.2 Bernoulli’s Equation

Exemplo 12.4Calculating Pressure: Pressure Drops as a Fluid Speeds UpIn Example 12.2, we found that the speed of water in a hose increased from 1.96 m/s to 25.5 m/s going from the hose to the nozzle. Calculate the pressure in the hose, given that the absolute pressure in the nozzle is…

College Physics12.3 The Most General Applications of Bernoulli’s Equation

Exemplo 12.5Calculating Pressure: A Fire Hose NozzleFire hoses used in major structure fires have inside diameters of 6.40 cm. Suppose such a hose carries a flow of 40.0 L/s starting at a gauge pressure of 1.62×10^6N/m^2. The hose goes 10.0 m up a ladder to a nozzle…
Exemplo 12.6Calculating Power in a Moving FluidSuppose the fire hose in the previous example is fed by a pump that receives water through a hose with a 6.40-cm diameter coming from a hydrant with a pressure of 0.700×10^6N/m^2. What power does the pump supply to…

College Physics12.4 Viscosity and Laminar Flow; Poiseuille’s Law

Exemplo 12.7Using Flow Rate: Plaque Deposits Reduce Blood FlowSuppose the flow rate of blood in a coronary artery has been reduced to half its normal value by plaque deposits. By what factor has the radius of the artery been reduced, assuming no turbulence occurs?
Exemplo 12.8What Pressure Produces This Flow Rate?An intravenous (IV) system is supplying saline solution to a patient at the rate of 0.120cm^3/s through a needle of radius 0.150 mm and length 2.50 cm. What pressure is needed at the entrance of the needle to cause…

College Physics12.5 The Onset of Turbulence

Exemplo 12.9Is This Flow Laminar or Turbulent?Calculate the Reynolds number for flow in the needle considered in Example 12.8 to verify the assumption that the flow is laminar. Assume that the density of the saline solution is 1025 kg/m^3.

College Physics12.6 Motion of an Object in a Viscous Fluid

Exemplo 12.10Does a Ball Have a Turbulent Wake?Calculate the Reynolds number NR^′ for a ball with a 7.40-cm diameter thrown at 40.0 m/s.

College Physics12.7 Molecular Transport Phenomena: Diffusion, Osmosis, and Related Processes

Exemplo 12.11Calculating Diffusion: How Long Does Glucose Diffusion Take?Calculate the average time it takes a glucose molecule to move 1.0 cm in water.