1. Question DetailsCJ9 11.P.055. [2029001] A patient recovering from surgery is being given fluid intravenously. The fluid has a density of 1070 kg/m 3, and9.99 10 4 m 3 of it flows into the patient every five hours. Find the mass flow rate in kg/s. 5.94e 05 kg/s Sep 28 7:39 AM 2. Question DetailsCJ9 11.P.058.GO. [2028807] Water flows straight down from an open faucet. The cross sectional area of the faucet is 2.00 10 4 m 2, and the speed of the water is 0.78 as it leaves the faucet. Ignoring air resistance, find the cross sectional area of the water stream at a point 0.11 m below the faucet. Sep 28 7:40 AM 1
3. Question DetailsCJ9 11.P.060. [2141567] Three fire hoses are connected to a fire hydrant. Each hose has a radius of 0.022 m. Water enters the hydrant through an underground pipe of radius 0.087 m. In this pipe the water has a speed of 2.9. (a) How many kilograms of water are poured onto a fire in one hour by all three hoses? 2.48e+05 kg (b) Find the water speed in each hose. 15.1 Sep 28 7:41 AM 4. Question DetailsCJ9 11.P.061. [2029948] Prairie dogs are burrowing rodents. They do not suffocate in their burrows, because the effect of air speed on pressure creates sufficient air circulation. The animals maintain a difference in the shapes of two entrances to the burrow, and because of this difference, the air (ρ = 1.29 kg/m 3 ) blows past the openings at different speeds, as the drawing indicates. (va = 8.1, and vb = 1.0.) Assuming that the openings are at the same vertical level, find the difference in air pressure between the openings. 41.7 Pa Indicate which way the air circulates. The air enters at B and exits at A. Sep 28 7:41 AM 2
5. Question DetailsCJ9 11.P.066. [3344948] Interactive LearningWare 11.2 provides a review of the concepts that are important in this problem. A small crack occurs at the base of a 14.5 m high dam. The effective crack area through which water leaves is 1.35 10 3 m 2. (a) Ignoring viscous losses, what is the speed of water flowing through the crack? 16.9 (b) How many cubic meters of water per second leave the dam? 0.0228 m 3 /s Sep 28 7:42 AM 6. Question DetailsCJ9 11.P.067. [2028584] Water is circulating through a closed system of pipes in a two floor apartment. On the first floor, the water has a gauge pressure of 3.10 10 5 Pa and a speed of 1.8. However, on the second floor, which is 4.4 m higher, the speed of the water is 3.8. The speeds are different because the pipe diameters are different. What is the gauge pressure of the water on the second floor? 2.61e+05 Pa Sep 30 8:18 AM 3
7. Question DetailsCJ9 11.P.069. [2028124] A venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at a speed v 2 through a horizontal section of pipe whose cross sectional area A 2 = 0.0700 m 2. The gas has a density of ρ = 1.50 kg/m 3. The Venturi meter has a crosssectional area of A 1 = 0.0400 m 2 and has been substituted for a section of the larger pipe. The pressure difference between the two sections is P 2 P 1 = 110 Pa. (a) Find the speed v 2 of the gas in the larger original pipe. 8.43 (b) Find the volume flow rate Q of the gas. 0.59 m 3 /s Sep 30 8:19 AM 8. Question DetailsCJ9 11.P.070. [2028232] A hand pumped water gun is held level at a height of 0.78 m above the ground and fired. The water stream from the gun hits the ground a horizontal distance of 7.05 m from the muzzle. Find the gauge pressure of the water gun's reservoir at the instant when the gun is fired. Assume that the speed of the water in the reservoir is zero and that the water flow is steady. Ignore both air resistance and the height difference between the reservoir and the muzzle. 1.56e+05 Pa Sep 30 8:20 AM 4
9. Question DetailsCJ9 11.P.074. [2141573] A pump and its horizontal intake pipe are located 98 m beneath the surface of a large reservoir. The speed of the water in the intake pipe causes the pressure there to decrease, in accord with Bernoulli's principle. Assuming nonviscous flow, what is the maximum speed with which water can flow through the intake pipe? (Assume atmospheric pressure is 1.01 10 5 Pa.) 46.1 Sep 30 8:20 AM 10. Question DetailsCJ9 11.P.076. [2201924] Two circular holes, one larger than the other, are cut in the side of a large water tank whose top is open to the atmosphere. The center of one of these holes is located twice as far beneath the surface of the water as the other. The volume flow rate of the water coming out of the holes is the same. (a) Decide which hole is located nearest the surface of the water. the larger holethe smaller hole (b) Calculate the ratio of the radius of the larger hole to the radius of the smaller hole. 1.19 Sep 30 8:20 AM 5
Sep 30 8:23 AM 6