do fast A given star orbits the center of its galaxy at an average speed of Ustar, at a distanceof rstar from the center. The galaxy has 2 spiral arms, and the arms themselves orbitslower than the star -- at the same radius, they orbit at a speed of Varms (in the samedirection as the star). The galaxy's age is tgal.In the history of this galaxy, how many times did this star cross through a spiral arm?Values:Vstar200 km/srstar = 9 kpcVarms 42 km/stgal = 5 GyrRound your answer to the nearest whole number.

To find out how many times a star has crossed through a spiral arm of its galaxy during the galaxy's…

Answered: A given star orbits the center of its…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter11: Simulation Models

Section: Chapter Questions

Problem 54P

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Consider the two-dimensional incompressible velocity potential Φ=xy-x²-y² Find the equation of the streamline that passes through (x,y)=(13,12) The equation of the streamline is ψ=______
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The drum has a weight of 72 lb and a radius of gyration kO=0.4ft . If the cable, which is wrapped around the drum, is subjected to a vertical force P = 12 lb, determine the time needed to increase the drum's angular velocity from \omega 1=5rad/s to \omega 2=25rad/s . Neglect the mass of the cable.
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Miles Filtration, Inc. provides maintenance services for water filtration systems throughout Southern Florida. Customers contact Johnson with requests for maintenance service on their water filtration systems. To estimate service time and the service cost, Johnson’s managers want to predict the repair time necessary for each maintenance request. Hence, repair time in hours is the dependent variable. Repair time is believed to be related to three factors: the number of months since the last maintenance service, the type of repair problem (mechanical or electrical), and the repairperson who performs the repair (Donna Newton or Bob Jones). Data for a sample of 10 service calls are reported in the following table: Develop the multiple regression equation to predict repair time, given the number of months since the last maintenance service, the repairperson, and the type of repair. What are the interpretations of the estimated regression parameters? What does the coefficient of…

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