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freight train consists of two 8.00×10 -kg engines and 45
Chapter 18, Problem 16PE(choose chapter or problem)
freight train consists of two 8.00×10? -kg engines and 45 cars with average masses of 5? 5.50×10? kg . (a) What force must each engine exert backward on the track to accelerate the train at a rate of 5.00×10? m / s? if the force of friction is 7.50×10? N , assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (b) What is the magnitude of the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?
Questions & Answers
QUESTION:
freight train consists of two 8.00×10? -kg engines and 45 cars with average masses of 5? 5.50×10? kg . (a) What force must each engine exert backward on the track to accelerate the train at a rate of 5.00×10? m / s? if the force of friction is 7.50×10? N , assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (b) What is the magnitude of the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?
ANSWER:Step-by-step solution Step 1 of 4 (a) The total mass of the system is: Here, stands for average mass of car and stands for mass of the freight train engine. Substitute for and for ,