Answer to Question #241840 in Mechanical Engineering for Papi Chulo

Question

A train of mass 220 tonnes starts from rest up a grade of 1 in 90 incline. It reaches a speed of 72 km/hr in a distance of 900 m (up the incline). The acceleration is uniform and the tractive resistance is 0,75 % of the weight of the train. Use Newton’s second law to calculate the tractive effort required.

During your calculations clearly show:

a=?

TE=?

Answer 1

$20^2=2(900)a\\a=0.22\frac{m}{s^2}\\$

$TE=220000(0.22+9.8(0.011)+9.8(0.0075))\\=88.3\ kN$