The $$Little Engine That Could$-$ Is pulling $35$ train cars of mass $600$ kg each up a slope angled at $25$ degrees above horizontal. The coefficient of friction between each car and the slope is $0\mathrm{.}17.$ If the engine pulled on the first car with a force of $355,000$N what is the tension in the coupling joining the $19$th and $20$th cars? $($Note: Assume the $1$st car is in the front of the train.$)$