Question

Поезд массой 600т, отойдя от станции на 2,5 км, приобрёл скорость 60 км ч , какую среднюю силу сопротивления грунта

Answer 1

N=A/t

A=F*S

Fтр=0,005*10*60000=3000H

t=S/V=150.6c

N=3000*2500/150.6=5*105B=50kB

Answer 2

Calculating Average Resistance Force

To calculate the average resistance force of the ground, we can use the formula:

Average Resistance Force = (Total Force - Propulsive Force) / Distance

Where: - Total Force = Force required to move the train - Propulsive Force = Force provided by the train's engine - Distance = Distance traveled by the train

Given Data

- Mass of the train (m) = 600 tons = 600,000 kg - Distance traveled (d) = 2.5 km = 2,500 m - Speed of the train (v) = 60 km/h = 16.67 m/s (converted from km/h to m/s)

Calculating Total Force

The total force required to move the train can be calculated using the formula:

Total Force = Mass × Acceleration

Since the train is already moving at a constant speed, the acceleration is 0 m/s². Therefore, the total force required is simply the force needed to overcome the resistance.

Calculating Propulsive Force

The propulsive force provided by the train's engine can be calculated using the formula:

Propulsive Force = Mass × Acceleration

As mentioned earlier, since the train is moving at a constant speed, the acceleration is 0 m/s². Therefore, the propulsive force is also 0 N.

Applying the Formulas

Now, let's apply the formulas to calculate the average resistance force:

Total Force = Mass × Acceleration = 600,000 kg × 0 m/s² = 0 N Propulsive Force = Mass × Acceleration = 600,000 kg × 0 m/s² = 0 N Average Resistance Force = (Total Force - Propulsive Force) / Distance = (0 N - 0 N) / 2,500 m = 0 N / 2,500 m = 0 N/m

Therefore, the average resistance force of the ground is 0 N/m.