Physics

Fluids

A pipe carrying fresh spring water has a constriction, where it narrows from a radius of 0.95919 m down to a radius of 0.59141 m. If the water is moving with a speed of 2.1781 m/s in the wider part of the pipe, what is the water's speed in the narrower part? a O 5.7194 m/s O 5.7094 m/s O 5.7294 m/s h O 5.6994 m/s O 5.6894 m/s O 5.6794 m/s

11:46 Take Quiz Exit a The figure below shows a dense liquid flowing through a horizontal pipe with two varying cross-sections. In the first section, the area is 10.9 cm2 and the flow speed is 2.03 m S . In the second section, the area is 2 cm? Calculate the smaller section's flow speed. For reference, the density of the liquid is kg = Pliquid 1.65 8 cm3 = 1650 m3 Submit your answer without units (you can calculate your answer using Sl units or the given units, it's irrelevant.

11. A fluid flows through a horizontal pipe. At a certain point the cross section of the pipe quadruples. a. The speed of the fluid in the wider section of the pipe has a speed that is O half the speed of the water in the narrow section of pipe. O one quarter the speed of the water in the narrow section of pipe. O double the speed of the water in the narrow section of pipe. O four times the speed of the water in the narrow section of pipe. O the same as the speed of the water in the narrow section of pipe. b The pressure of the fluid in the pipe O increases as it flows from the narrow section of pipe to the wider section. O decreases as it flows from the narrow section of pipe to the wider section. stays constant as it flows from the narrow section of pipe to the wider section.

Determine the y coordinate of the location of the resultant force on the plate. Express your answer to three significant figures and include the appropriate units. View Available Hint(s) The parabolic plate is subjected to a fluid pressure that varies linearly from 0 at its top to 100 lb/ft? at its bottom B (Figure 1). Suppose that a = 2.8 ft and b = 7.84 ft. Hibbeler14.ch9.p126_1.jpg a Search ? B uÅ Value Units a a Submit Provide Feedback < Return to Assignment Next Preview ? w 2 NOVI 15

Due Wednesday by 11:59pm Points 3 Submitting an external tool ales Available after Aug 3 at 11:59pm uncements gnments <HW31 - Chapter 9 - Section 4-5 - Hydrostatic pressure - Part 2 m Problem 9.126 - Enhanced - with Hints and Feedback < 3 of 3 cussions a Review des Determine the magnitude of the resultant force. ople The parabolic plate is subjected to a fluid pressure that varies linearly from 0 at its top to 100 lb/ft? at its bottom B (Figure 1). Suppose that a = 2.8 ft and b = 7.84 ft. Hibbeler14.ch9.p126_1.jpg O Search Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) e G HA Fr = 4.704 ft Submit Previous Answers * Incorrect; Try Again Stu Next > B ? @

1 Peren Part A Hibbler.ch9.f21.jpg a Search Determine the magnitude of the hydrostatic force acting on gate AB, which has a width of 5 ft. The specific weight of water is y = 62.4 lb/ft? (Figure 1) Express your answer to three significant figures and include the appropriate units. 6 ft A JA 4 ft FR = Value Units B 3 ft - Submit Request Answer

a 18. A rock with a volume of 0.27 In’ is fully submerged in water having a density of 1000 Kg/m3. Knowing that the acceleration due to the gravity g = 9.80 m/s2, then the buoyant force acting on this rock is equal to A. 400 N B. 39.24 N C. 392.4N D. 3924 N. E. 2646.0 N

2. A rock with a mass of 540 g in air is found to have an apparent mass of 342 g when submerged in water. (a) What mass of water is displaced? (b) What is the volume of the rock? (c) What is its average density? Is this consistent with the value for granite? (granite has a density of 2700 kg/m)

Part A A 30-cm-diameter vertical cylinder is sealed at the top by a frictionless 16 kg piston. The piston is 76 cm above the bottom when the gas temperature is 306°C. The air above the piston is at 1.00 atm pressure. What is the gas pressure inside the cylinder? Express your answer with the appropriate units. View Available Hint(s) H ? Po Value Pa Submit Part B What will the height of the piston be if the temperature is lowered to 19°C? Express your answer with the appropriate units. View Available Hint(s) 0 HÅ ? hi Value cm

Phys 111 Fall 2021 Homework #24 Due Wednesday, November 10th 1. What fraction of ice is submerged when it floats in freshwater, given the density of water at 0°C is very close to 1000 kg/m?? (density of ice at 0°C is 917 kg/m²) 2. A rock with a mass of 540 g in air is found to have an apparent mass of 342 g when submerged in water. (a) What mass of water is displaced? (b) What is the volume of the rock? (c) What is its average density? Is this consistent with the value for granite? (granite has a density of 2700 kg/m?)

Q7 (1 point) A fireman is spraying water horizontally out of the nozzle of a firehose. The water flow rate is (measured in m?/s), the water density is p (measured in kg/m²), and the cross-sectional area of the nozzle is A (measured in m²). What is the magnitude of the horizontal force the nozzle exerts on the fireman's hands? Hint: Think rocket thrust. Rpl A 2RpA RºplA 2R² plA None of the above.

3. A small steel cylinder is thrown into the water. It has a height of 11 cm and a radius of 2 cm. Its initial velocity of falling brings the top of the cylinder 1 meter underwater (the cylinder is standing upright). Steel has a density of 7.8 kg/m3. a. At this moment where the cylinder's top is 1 meter underwater, what is the force of water pressing down on it? b. At the same moment, what is the force of water pressing up on the cylinder? c. What is the buoyant force acting on the cylinder? d. What is the force of gravity on the cylinder? e. What is the net acceleration of the cylinder at this moment? Does the cylinder sink further or float to the top?

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