You are working as an engineer for the New York City subway system. Your job is to evaluate the chains which will link the subway cars together. The chains that the city is thinking of using are rated at a maximum of 20,000 N (they will break if they experience a tension larger than this). Subway cars have two chains linking them to the next car (one on the left and right side of the car). Assuming each train has 4 cars, that each car has a mass of 5000 kg, and that the maximum acceleration of the trains is 3.0 m/sec2, are the chains safe to use? Your supervisor will want to know the tension in the chains for each of the three couplings, engineers are picky that way. [Hint: start by considering the forces on the last train car].

Guest Oct 6, 2017

#1**+3 **

"*You are working as an engineer for the New York City subway system. Your job is to evaluate the chains which will link the subway cars together. The chains that the city is thinking of using are rated at a maximum of 20,000 N (they will break if they experience a tension larger than this). Subway cars have two chains linking them to the next car (one on the left and right side of the car). Assuming each train has 4 cars, that each car has a mass of 5000 kg, and that the maximum acceleration of the trains is 3.0 m/sec2, are the chains safe to use? Your supervisor will want to know the tension in the chains for each of the three couplings, engineers are picky that way. [Hint: start by considering the forces on the last train car]*."

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Alan
Oct 6, 2017