An 'anti-drowning' bracelet is a water safety device. It contains a CO2 cartridge that can quickly inflate an airbag to help a diver rise to the surface in an emergency situation. Robert Irwin (son of "The ID: 2 0 1 Rep: 2 1 0 Crocodile Hunter" Steve Irwin) is snorkeling at the Great Barrier Reef Eq: 1 0 (Pseawater 1029 kg/m3). He swims 5.0 m below the surface of the water when there is an emergency and he activates the bracelet. The mass of Robert and his gear is 69.2 kg and the volume of salt water he displaces is 0.07 m3 before the safety device is activated. Once he activates the device, it inflates to a volume of 0.01 m3. How 1 Check: 0.5 0 -2 -1 0 Neat: Total: Y N Correct ans: long would it take him to get to the surface assuming he starts from rest (ignore any drag forces from the water)? ID fWIas, dispia cement, density 0.07 m3 5.0 M p 1029 Kgm ba 0.01 m 3 P= P= 09.2 : 988.57 Kg/m3 O.07

An 'anti-drowning' bracelet is a water safety device. It contains a CO2 cartridge that can quickly inflate an airbag to help a diver rise to the surface in an emergency situation. Robert Irwin (son of "The ID: 2 0 1 Rep: 2 1 0 Crocodile Hunter" Steve Irwin) is snorkeling at the Great Barrier Reef Eq: 1 0 (Pseawater 1029 kg/m3). He swims 5.0 m below the surface of the water when there is an emergency and he activates the bracelet. The mass of Robert and his gear is 69.2 kg and the volume of salt water he displaces is 0.07 m3 before the safety device is activated. Once he activates the device, it inflates to a volume of 0.01 m3. How 1 Check: 0.5 0 -2 -1 0 Neat: Total: Y N Correct ans: long would it take him to get to the surface assuming he starts from rest (ignore any drag forces from the water)? ID fWIas, dispia cement, density 0.07 m3 5.0 M p 1029 Kgm ba 0.01 m 3 P= P= 09.2 : 988.57 Kg/m3 O.07

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter14: Fluid Mechanics

Section: Chapter Questions

Problem 46AP: Review. In a water pistol, a piston drives water through a large tube of area A1 into a smaller tube...

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Review. In a water pistol, a piston drives water through a large tube of area A1 into a smaller tube of area A2 as shown in Figure P14.46. The radius of the large tube is 1.00 cm and that of the small tube is 1.00 mm. The smaller tube is 3.00 cm above the larger tube. (a) If the pistol is fired horizontally at a height of 1.50 m, determine the time interval required for the water to travel from the nozzle to the ground. Neglect air resistance and assume atmospheric pressure is 1.00 atm. (b) If the desired range of the stream is 8.00 m, with what speed v2 must the stream leave the nozzle? (c) At what speed v1 must the plunger be moved to achieve the desired range? (d) What is the pressure at the nozzle? (e) Find the pressure needed in the larger tube. (f) Calculate the force that must be exerted on the trigger to achieve the desired range. (The force that must be exerted is due to pressure over and above atmospheric pressure.) Figure P14.46
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