Question

Oпределите изменение импульса автомобиля массой 2 т, если он двигается со скоростью 54 км/ч и через 10 мин остановился.

Answer 1

Ответ:

30000 кг*м/с

Объяснение:

m=2000 кг    vo=15 м/с    t=600 c    Δp=?

===

Δp=m*Δv

vk=0

Δv=vo

Δp=m*vo=2000*15=30000 кг*м/с

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Answer 2

Calculation of Change in Momentum

To calculate the change in momentum of a car, we can use the formula:

Change in momentum = final momentum - initial momentum

The momentum of an object is given by the product of its mass and velocity:

Momentum = mass * velocity

Given that the car has a mass of 2 tons (or 2000 kg) and is initially moving at a speed of 54 km/h, we can calculate the initial momentum:

Initial momentum = mass * initial velocity

Initial momentum = 2000 kg * (54 km/h * (1000 m/1 km) * (1 h/3600 s))

Converting the units, we have:

Initial momentum = 2000 kg * (54,000 m/3600 s)

Simplifying the calculation:

Initial momentum = 2000 kg * 15 m/s

Initial momentum = 30,000 kg·m/s

Now, let's calculate the final momentum when the car comes to a stop after 10 minutes (or 600 seconds):

Final momentum = mass * final velocity

Since the car comes to a stop, the final velocity is 0 m/s:

Final momentum = 2000 kg * 0 m/s

Final momentum = 0 kg·m/s

Finally, we can calculate the change in momentum:

Change in momentum = Final momentum - Initial momentum

Change in momentum = 0 kg·m/s - 30,000 kg·m/s

Change in momentum = -30,000 kg·m/s

Therefore, the change in momentum of the car with a mass of 2 tons, moving at a speed of 54 km/h, and coming to a stop after 10 minutes is -30,000 kg·m/s.

Please note that the negative sign indicates a decrease in momentum, which is expected as the car comes to a stop.