Question

Поезд массой 600т, отойдя от станции на 2.5 км, приобрёл скорость 72 км/ч. Примите, что поезд двигался с постоянным ускорением и средняя сила сопротивления движению равна 0.005 от веса поезда. Определить ускорение поезда​

Answer 1

Ответ:

N=A/t

A=F*S

Fтр=0.005*10*60000=3000Н

t=S/V=150.6 c

N=3000*2500/150.6=5*105В=50kB

Answer 2

Calculating the Train's Acceleration

To calculate the train's acceleration, we can use the following formula:

Acceleration (a) = (Net Force) / (Mass)

Where: - Net Force = (Driving Force) - (Resistance Force) - Driving Force = (Mass) * (Acceleration) - Resistance Force = (Coefficient of Resistance) * (Weight)

Given: - Mass of the train (m) = 600,000 kg (600 tons = 600,000 kg) - Distance traveled (d) = 2.5 km = 2500 m - Initial velocity (u) = 0 m/s (assuming the train starts from rest) - Final velocity (v) = 72 km/h = 20 m/s - Coefficient of Resistance (k) = 0.005 - g (acceleration due to gravity) = 9.81 m/s^2

First, let's calculate the time it took for the train to reach the final velocity using the equation: v = u + at where: - v = final velocity - u = initial velocity - a = acceleration - t = time

Rearranging the equation to solve for time: t = (v - u) / a

Substituting the given values: t = (20 m/s - 0 m/s) / a

Now, we can calculate the time it took for the train to reach the final velocity.

Calculating Time Taken

The time taken by the train to reach the final velocity can be calculated using the given values: t = (20 m/s - 0 m/s) / a

Let's calculate the time taken.

Solving for Acceleration

Now that we have the time taken by the train to reach the final velocity, we can use this information to solve for the acceleration using the equation: d = ut + (1/2)at^2 where: - d = distance traveled - u = initial velocity - t = time - a = acceleration

Rearranging the equation to solve for acceleration: a = 2(d - ut) / t^2

Substituting the given values: a = 2(2500 m - 0 m/s * t) / t^2

We can now calculate the acceleration of the train.

Conclusion

The acceleration of the train can be calculated using the provided information. Let's proceed with the calculations.