Concept explainers
(II) A typical scuba tank, when fully charged, contains 12 L of air at 204 atm. Assume an “empty” tank contains air at 34 atm and is connected to an air compressor at sea level. The air compressor intakes air from the atmosphere, compresses it to high pressure, and then inputs this high-pressure air into the scuba tank. If the (average) flow rate of air from the atmosphere into the intake port of the air compressor is 290L/min, how long will it take to fully charge the scuba tank? Assume the tank remains at the same temperature as the surrounding air during the filling process.
Want to see the full answer?
Check out a sample textbook solutionChapter 17 Solutions
PHYSICS F/SCI.+ENGINEERS W/MOD.PHYSICS
Additional Science Textbook Solutions
Tutorials in Introductory Physics
Life in the Universe (4th Edition)
Lecture- Tutorials for Introductory Astronomy
College Physics
Applied Physics (11th Edition)
Physics (5th Edition)
- Water supplied to a house by a water main has a pressure of 3.00105N/m2 early on a summer day when neighborhood use is low. This pressure produces a flow of 20.0 L/min through a garden hose. Later in the day, pressure at the exit of the water main and entrance to the house drops, and a flow of only 8.00 L/min is obtained through the same hose. (a) What pressure is now being supplied to the house, assuming resistance is constant? (b) By what factor did the flow rate be water main increase in order to cause this decrease in delivered pressure? The pressure at the entrance of the water main is 5.00105N/m2 , and the original rate was 200 L/min. (c) How many more users are there, assuming each would consume 20.0 L/min in be morning?arrow_forwardConsider the piston cylinder apparatus shown in Figure P20.81. The bottom of the cylinder contains 2.00 kg of water at just under 100.0c. The cylinder has a radius of r = 7.50 cm. The piston of mass m = 3.00 kg sits on the surface of the water. An electric heater in the cylinder base transfers energy into the water at a rate of 100 W. Assume the cylinder is much taller than shown in the figure, so we dont need to be concerned about the piston reaching the top of the cylinder. (a) Once the water begins boiling, how fast is the piston rising? Model the steam as an ideal gas. (b) After the water has completely turned to steam and the heater continues to transfer energy to the steam at the same rate, how fast is the piston rising?arrow_forward2) The pump of a water distribution system is powered by an electric motor whose efficiency is 80% with a shaft that is 97% efficient and a pump that is 60% efficient. The water flow rate through the pump is 0.2 m³/s. What is the total efficiency of the pump/motor assembly? The diameters of the inlet and outlet pipes are the same, and the elevation difference across the pump is negligible. If the pressures at the inlet and outlet of the pump are measured to be 70 kPa and 720 kPa (absolute), respectively, determine the electrical consumption of the pump.arrow_forward
- (Buoyancy) A hot-air balloon weighs 490 lb, including the weight of the balloon, the basket, and one person. The air outside the balloon has a temperature of 79 °F, and the heated air inside the balloon has a temperature of 149 °F. Assume the inside and outside air to be at standard atmospheric pressure of 14.2 psia. (a) Determine the required volume of the balloon to support the weight. (b) If the balloon had a spherical shape, what would be the required diameter? ft³ (a) V = i (b) d= i eTextbook and Media Save for Later ft Attempts: 0 of 3 used Submit Answerarrow_forward(c) Figure 1 shows two pipes of equal and constant diaeter leave a water pumping station and dump water out of an open end that is open to the atmosphere.The water enters at a pressure of two atmospheres and a speed of 1.8 m/s. One pipe drops at a height of 15 m. Calculate the velocity the water as the water leaves each pipe. P1 3 atm P, = 1 atm v1 = 1.8 m/s V2 =? P1 = 3 atm v1 = 1.8 m/s 15 m = 1 atm =? Figure 1 12arrow_forwardSmall differences in gas pressures are commonly measured with a micro-manometer of the type illustrated in Fig. (3). This device consists of two large reservoirs each having a cross sectional area A, which are filled with a liquid having a specific weight Y1 and connected by a U-tube of cross-sectional area A, containing a liquid of specific weight y2. When a differential gas pressure, P, - P2 , is applied, a differential reading, h, develops. It is desired to have this reading sufficiently large (so that it can be easily read) for small pressure At differentials. Determine the relationship between h and P1 P, when the area ratio is small, and show Ar that the differential reading, h, can be magnified by making the difference in specific weights, Y2 - Y1 , small. Assume that initially (with P = 2P2). %3D P1 P2 Y1 Figure (3)arrow_forward
- A woman jogging has a metabolic rate of 625 W. (a) Calculate her volume rate of oxygen consumption in L/s. (b) Estimate her required respiratory rate in breaths/min if her lungs inhale 0.600 L of air in each breath and air is 20.9% oxygen.arrow_forwardIn a dry-pipe sprinkler valve, the air seat typically has a surface area on which the air pressure acts six times as large as the water seat upon which the water pressure acts. If the water pressure is 105 psi, what air pressure is required to attain a state of equilibrium? answer should be in ( psi )arrow_forwardCalculate the height of capillary rise in a soil pore of 50 µm inner diameter in winter (5°C), spring (20°C), summer (30°C), and the tropics (40°C). Compute the maximum size of the pores that will retain water in soil corresponding to suction (capillary height) of 330 cm and 15,000 cm of water.arrow_forward
- If you blow a thin stream of air with a speed of 7.2 m/s out of your mouth, what is the overpressure in your mouth? Assume that the speed of the air in your mouth is (nearly) zero.arrow_forwardDuring inhalation, a person's diaphragm and intercostal muscles contract, expanding the chest cavity and lowering the internal air pressure below ambient so that air flows in through the mouth and nose to the lungs. Suppose a person's lungs hold 1240 mL of air at a pressure of 1.00 atm. If they expand their chest cavity by 515 mL while keeping their nose and mouth closed so that no air is inhaled, what will be the air pressure in their lungs in atm? Assume the air temperature remains constant.arrow_forwardIf a scuba diver fills his lungs to full capacity of 5.5 L when9.0 m below the surface, to what volume would his lungsexpand if he quickly rose to the surface? Is this advisable?arrow_forward
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice UniversityPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning