Question

Трактор двигаясь равномерно за время 5 минут проходит путь 400 м. При этом сила тяги двигателя равна 40 кН, а полезная мощность двигателя - N. Найти полезную мощность двигателя.

Answer 1

N=A/t=F*S/t=40*400/5*60=53,3 кВт

Answer 2

Calculation of Useful Power of the Engine

To find the useful power of the engine, we need to use the formula:

Useful Power (N) = Force (F) x Velocity (v)

Given: - Force of traction (F) = 40 kN - Time (t) = 5 minutes = 5 * 60 seconds = 300 seconds - Distance (d) = 400 m

To find the velocity (v), we can use the formula:

Velocity (v) = Distance (d) / Time (t)

Substituting the given values:

Velocity (v) = 400 m / 300 s = 1.33 m/s

Now, we can calculate the useful power (N):

Useful Power (N) = Force (F) x Velocity (v) = 40 kN x 1.33 m/s

Converting kN to N:

Useful Power (N) = 40,000 N x 1.33 m/s = 53,200 N·m/s

Therefore, the useful power of the engine is 53,200 N·m/s.