4.66 An air-water manometer is connected to a Pitot-static tube used to measure air velocity. If the manometer deflects 2 in., what is the velocity? Assume T = 60°F and p = 15 psia. %3D
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- An airtight dispenser for drinking water is 25 cm × 10 cm in horizontal dimensions and 20 cm tall. It has a tap of negligible volume that opens at the level of the bottom of the dispenser. Initially, it contains Water to a level 3.0 cm from the top and air at the ambient pressure, 1.00 atm, from there to the top. When the tap is opened, water will flow out until the gauge pressure at the bottom of dispenser, and thus at the opening of the tap, is 0. What volume of water flows out? Assume the temperature is constant, the dispenser is perfectly rigid, and the water has a constant density of 1000 kg/m3.A cylinder that has a 40.0-cm radius and is 50.0 cm deep is filled with air at 20.0C and 1.00 atm (Fig. P10.74a). A 20.0-kg piston is now lowered into the cylinder, compressing the air trapped inside as it takes equilibrium height hi (Fig. P16.74b). Finally, a 25.0-kg dog stands on the piston, further compressing the air, which remains at 20C (Fig. P16.74c). (a) How far down (h) does the piston move when the dog steps onto it? (b) To what temperature should the gas be warmed to raise the piston and dog back to hi?(a) Given that air is 21% oxygen, find the minimum atmospheric pressure that gives a relatively safe partial pressure of oxygen of 0.16 atm. (b) What is the minimum pressure that gives a partial pressure of oxygen above the quickly fatal level of 0.06 atm? (c) The air pressure at the summit of Mount Everest (8848 m) is 0.334 atm. Why have a few people climbed it without oxygen, while some who have tried, even though they had trained at high elevation, had to tum back?
- Two bicycle tires are set rolling with the same initial speed of 4.0 m/sm/s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 psipsi and goes a distance of 17.2 mm ; the other is at 105 psipsi and goes a distance of 92.9 mm . Assume that the net horizontal force is due to rolling friction only and take the free-fall acceleration to be ggg = 9.8 m/s2m/s2 . What is the coefficient of rolling friction μrμrmu_r for the tire under low pressure?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.Two bicycle tires are set rolling with the same initial speed of 4.0 m/sm/s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 psipsi and goes a distance of 17.2 mm ; the other is at 105 psipsi and goes a distance of 92.9 mm . Assume that the net horizontal force is due to rolling friction only and take the free-fall acceleration to be gg = 9.8 m/s2m/s2 . What is the coefficient of rolling friction μrμr for the second tire (the one inflated to 105 psipsi)?
- The classic Goodyear blimp is essentially a helium balloon— a big one, containing 5700 m3 of helium. If the envelope and gondola have a total mass of 4300 kg, what is the maximum cargo load when the blimp flies at a sea-level location? Assume an air temperature of 20°C.At a spot in the high Andes, water boils at 80.0ºC , greatly reducing the cooking speed of potatoes, for example.What is atmospheric pressure at this location?A student foolishly attempts to stop a steel bar, of length L = 1 m and at a temperature of 20ºC, from thermally expanding by attaching it to a wooden support with a nail at each end. Steel's Young's modulus is Y = 1.1 × 1011 N/m2 and it's linear thermal expansion coefficient is α = 13 × 10-6 1/C. Randomized Variables Y = 1.1 × 1011 N/m2α = 13 × 10-6 1/C What is the volue of the stress, in pascals, that develops due to a rise of temprature to 21 C? Assuming the nails have a cross- sectional area of A= 10^-5 m^2 all of which is perpendicular to the stress force from the bar, what is the force acting on each due to that temperature rise?
- By what factor would a scuba diver’s lungs expand if she as-cended rapidly to the surface from a depth of 125 ft without in-haling or exhaling? If an expansion factor greater than 1.5 causeslung rupture, how far could she safely ascend from 125 ft with-out breathing? Assume constant temperature (d of seawater =1.04 g/mL; d of Hg =13.5 g/mL)How much work is done when 10 ft3 of an air is initially at a pressure of 1 atm and a temperature of 0oC experience an increase of pressure to 6 atm in a closed and rigid cylinder?At an altitude of 11,000 m (a typical cruising altitude for a jet airliner), the air temperature is -60.0 ∘C and the air density is 0.491 kg/m3. The molar mass of air is 28.8 g/mol. What is the pressure of the atmosphere at that altitude? (Note: The temperature at this altitude is not the same as at the surface of the earth, so the equation P=P0exp(−MgyRT) doesn't apply.)