(Assume no friction forces) A train of 100 railroad cars each with a mass of 6 x 104 kg is being pulled by a locomotive that has a mass of 4.5 x 105 kg. The train leaves the freight yard at 12:00 noon on May the 5th. It starts from an initial velocity of 0. It takes the locomotive 8 kilometers to get the train up to a speed of 75 km/hr. The train then travels at an average speed of 75 km/hr for 4,200 km. After 4,200 km the train decelerates to a stop in 20 minutes. How long in minutes (to the nearest hundredth of a minute) did it take to reach 75 km/hr at the beginning? How much work was done to get the train to 75 km/hr. What was the KE of the train when it reached 75 km/hr?
(Assume no friction forces) A train of 100 railroad cars each with a mass of 6 x 104 kg is being pulled by a locomotive that has a mass of 4.5 x 105 kg. The train leaves the freight yard at 12:00 noon on May the 5th. It starts from an initial velocity of 0. It takes the locomotive 8 kilometers to get the train up to a speed of 75 km/hr. The train then travels at an average speed of 75 km/hr for 4,200 km. After 4,200 km the train decelerates to a stop in 20 minutes. How long in minutes (to the nearest hundredth of a minute) did it take to reach 75 km/hr at the beginning? How much work was done to get the train to 75 km/hr. What was the KE of the train when it reached 75 km/hr? How much work was done on the train during the time it traveled the 4,200 km at 75 km/hr? What is the total distance the train traveled from beginning to end to the nearest km? What date and time does it arrive at its destination? (Date: Hour: min)? What is the work required to stop the train? What was the average force produced by the locomotive to stop the train? What is the kinetic energy of the train at its destination?
Minutes to Work to KE at work in
75 km/hour 75 km/hour 75 km/hour 4,200 km
total distance date of work to average force
to nearest km arrival stop to stop
KE at Destination
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