Figure $5-29$ shows a section of an alpine cable-car system. The maximum permitted mass of each car with occupants is $2800 \mathrm{~kg} .$ The cars, riding on a support cable, are pulled by a second cable attached to each pylon. What is the difference in tension between adjacent sections of pull cable if the cars are accelerated up to $35^{\circ}$ incline at $0.81 \mathrm{~m} / \mathrm{s}^{2}$ ?