3 (a) You pull a solid zinc ball with a density of 7.14 g/cm and a radius of 1.20 cm upward through a fluid at a constant speed of 7.00 cm/s. The fluid exerts a drag force that is directly proportional to speed, and the proportionality constant is 0.950 kg/s. What is the magnitude of the force (in N) you exert on the ball? (You may ignore the buoyant force.) 0.57 X Draw a free body diagram. What forces act upward on the ball? What forces act downward? What is the acceleration of the ball? Be careful of units when calculating the mass of the ball. N (b) What If? By what percentage would the upward force exerted on the zinc ball have to be increased for the speed of the ball in the fluid to increase to triple its original value? calculate a new force, given the new speed? es the value of b or the mass change? How is a percent increase calculated? % you use your result from part (a) Need Help? Read It

3 (a) You pull a solid zinc ball with a density of 7.14 g/cm and a radius of 1.20 cm upward through a fluid at a constant speed of 7.00 cm/s. The fluid exerts a drag force that is directly proportional to speed, and the proportionality constant is 0.950 kg/s. What is the magnitude of the force (in N) you exert on the ball? (You may ignore the buoyant force.) 0.57 X Draw a free body diagram. What forces act upward on the ball? What forces act downward? What is the acceleration of the ball? Be careful of units when calculating the mass of the ball. N (b) What If? By what percentage would the upward force exerted on the zinc ball have to be increased for the speed of the ball in the fluid to increase to triple its original value? calculate a new force, given the new speed? es the value of b or the mass change? How is a percent increase calculated? % you use your result from part (a) Need Help? Read It

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter15: Fluids

Section: Chapter Questions

Problem 52PQ: Figure P15.52 shows a Venturi meter, which may be used to measure the speed of a fluid. It consists...

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What is the greatest average speed of blood flow at 37° C in an artery of radius 2.00 mm if the flow is to remain laminar? What is the corresponding flow rate? Take the density of blood to be 1025 kg/m3.
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Calculate the Reynolds numbers for the flow of water through (a) a nozzle with a radius of 0.250 cm and (b) a garden hose with a radius of 0.900 cm, when the nozzle is attached to the hose. The flow rate through hose and nozzle is 0.500 us. Can the flow in either possibly be laminar?
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