The engines of the electric train during the movement at a speed of 15 m / s, use a power

The engines of the electric train during the movement at a speed of 15 m / s, use a power of 900 kW. KKD engines 0.8. You need to find out the thrust that the engine is developing.

Initial data: V (speed of the electric train) = 15 m / s; Ns (power used by electric train motors) = 900 kW (900 * 10 ^ 3 W); η (motor efficiency) = 80% (0.8).

The traction force developed by the electric train motors is determined from the formula: η = Np / Nc = F * V / Nc, whence F = η * Nc / V.

Let’s make a calculation: F = 0.8 * 900 * 10 ^ 3/15 = 48 * 10 ^ 3 N (48 kN).

Answer: Electric train engines develop a traction force of 48 kN.