Question

Масса поезда 1100т,скорость движения 54км/ч.Чему равно время торможения если сила сопративления движению состава 88кН.Чему равно изменение импульса тела?

Answer 1

M = 1100 000 кг
v = 54 км в час = 54000/3600 = 15 м в с
F = 88 кН = 88 000 Н
Изменение импульса Δp = m(v - 0) = mv = 1100000*15 = 16 500 000 кг м с⁻¹
Изменение импульса равно импульсу силы:
Δp = Ft
отсюда время торможения
t = Δp/F = 16500000/88000 = 188 c = 3 мин 8 сек

Answer 2

Calculation of Braking Time

To calculate the braking time of a train, we need to consider the force of resistance and the mass of the train. The formula to calculate the braking time is:

Braking Time = (Mass of the train * Velocity) / Force of resistance

Given: - Mass of the train = 1100 t (tonnes) - Velocity = 54 km/h - Force of resistance = 88 kN (kilonewtons)

First, let's convert the given values to SI units: - Mass of the train = 1100 t = 1100 * 1000 kg = 1,100,000 kg - Velocity = 54 km/h = 54 * (1000/3600) m/s = 15 m/s - Force of resistance = 88 kN = 88 * 1000 N = 88,000 N

Now, we can substitute these values into the formula to calculate the braking time:

Braking Time = (1,100,000 kg * 15 m/s) / 88,000 N

Calculating this expression gives us the braking time of the train.

Calculation of Change in Momentum

To calculate the change in momentum of the train, we need to consider the initial and final velocities of the train, as well as its mass. The formula to calculate the change in momentum is:

Change in Momentum = Mass * (Final Velocity - Initial Velocity)

Given: - Mass of the train = 1100 t = 1,100,000 kg - Initial Velocity = 0 m/s (assuming the train starts from rest) - Final Velocity = 15 m/s (as given)

Substituting these values into the formula, we can calculate the change in momentum of the train:

Change in Momentum = 1,100,000 kg * (15 m/s - 0 m/s)

Calculating this expression gives us the change in momentum of the train.

Please note that the values provided in this response are based on the given information and calculations.