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A plumber conies to your ancient apartment building where you have a part-time job as caretaker. He’s checking the hot-water heating system, and notes that the water pressure in the basement is 18 psi. He asks, “How high is the building?” “Three stories, each about 11 feet,” you reply. “OK, about 33 feet,” he says, pausing to do some calculations in his head. “The pressure is fine,” he declares. On what basis did he come to that conclusion?
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- How many cubic meters of helium are required to lift a light balloon with a 400-kg payload to a height of 8 000 m? Take Hc = 0.179 kg/m3. Assume the balloon maintains a constant volume and the density of air decreases with the altitude z according to the expression pair = 0e-z/8 000, where z is in meters and 0 = 1.20 kg/m3 is the density of air at sea level.arrow_forwardHow many cubic meters of helium are required to lift a balloon with a 400-kg payload to a height of 8 000 m? Take He = 0.179 kg/m3. Assume the balloon maintains a constant volume and the density of air decreases with the altitude z according to the expression air = 0ez/8, where z is in meters and 0 = 1.20 kg/m3 is the density of air at sea level.arrow_forwardA spherical submersible 2.00 m in radius, armed with multiple cameras, descends under water in a region of the Atlantic Ocean known for shipwrecks and finds its first shipwreck at a depth of 1.75 103 m. Seawater has density 1.03 103 kg/m3, and the air pressure at the oceans surface is 1.013 105 Pa. a. What is the absolute pressure at the depth of the shipwreck? b. What is the buoyant force on the submersible at the depth of the shipwreck?arrow_forward
- The systolic pressure of a patient is 110 mmHg and the diastolic pressure is 60 mmHg. Given that 760 mmHg is equivalent to 101.3 kPa, what is the systolic and diastolic blood pressure of this patient in units of Pascals?arrow_forwardThe suction pressure of a pump reads 450 mm Hg vacuum. What is the absolute pressure in psi? Round- off your answer to four decimal places.arrow_forwardPressure is defined by many units. The most common are based on measuring the length of mercury in inverted tubes where the atmospheric pressure pushes back against gravity until the two forces are balanced. This is seen in units like millimeters of mercury (mmHg) or inches of mercury (inHg); the latter of the two only really used in the US and one or two other countries. Another unit used in the US (especially for tire pressure) is pounds per square inch (PSI). Think about the definition of pressure and describe why PSI actually is the most accurate unit for pressure.arrow_forward
- A lid is put on a box that is 15.0 cm long, 13.0 cm wide, and 8.00 cm tall, and the box is then evacuated until its inner pressure is 0.881 × 105 Pa. Atmospheric pressure is 1.013 × 105 Pa. How much force is required to lift the lid in Seattle , on a day when the atmospheric pressure is 67.5 kPa (2/3 the value at sea level)?arrow_forwardThe blood pressure of an artery is measured at two heights: at the heart and 10 cm above the heart. The mass density of blood is about 1000 kg/m^3 and a typical artery has a diameter of 4 mm. (Use g = 10 m/s^2.) Compared to the pressure at heart height, the pressure 10 cm above is: Group of answer choices 100 P higher 1000 P lower 10 P higher 1000 P higher 100 P lowerarrow_forwardThe suction pressure of a pump reads 450mmHg vacuum. What is the absolute pressure in psi. Round off answer in four decimal places.arrow_forward
- You are with an excursion party on an exploration of the surface of Mars. You find a small lake of water of that 1.76 m. Assume the density of the freshwater is unchanged on Mars. You measure the absolute pressure at the bottom of the lake to be one 161,800 Pa. What is the absolute pressure (in atm) at the surface of the lake. Assume the value of G on Mars is 3.72 m/s^2arrow_forwardHumans evolved in Earth's atmosphere, therefore the pressures interior to the body are relatively close to atmospheric pressure. Because the differences between internal body pressures and atmospheric pressure are so small, individuals have a difficult time gauging the magnitude of atmospheric pressure. Suppose an individual is lying on his stomach with sheets of paper stacked on his back. If each sheet of paper has a mass of 0.00280 kg and is the standard letter size of 8.5 in by 11 in (0.216 m by 0.279 m), how many sheets must be stacked to produce a pressure on his back equal to atmospheric pressure (roughly 101325 Pa)?arrow_forwardQuestion: Lets think about the pressure difference for bubbles in soda. If the bubble has a radius of 1 um and a surface tension of 0.072 N/m what is the pressure difference between the bubble and the soda? Give your answer in 3 significant figures. Solution: The pressure difference is Paarrow_forward
- Physics 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 LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
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