Question

самолет массой 150 т в момент отрыва от поверхности земли имеет скорость 288 км/ч.Чему равна работа,совершаемая двигателем самолёта при его разбеге?Чему равно изменение кинетической энергии самолёта?

Answer 1

A=F*S

F=m*a

a=Vконечное / 2S

A=(m*Vкон*S)/2S  

S сокращаются в числителе и знаменателе

получаем

A=(m*Vк)/2

A=(150000кг*80м/с)/2=6 000 000 Дж = 6МДж

Величины сразу перевел в систему СИ

Изменение Eк = (mVк^2)/2-(m*Vначальное в квадрате)/2

Т.к Vначальное =0 то Изменение Eк= (m*V^2)/2 

дельта Eк = (150000*80^2)/2=480 000 000Дж=480 МДж.

Answer 2

Calculation of Work Done by the Aircraft Engine during Takeoff Run

To calculate the work done by the aircraft engine during takeoff run, we can use the formula:

Work = Force x Distance

In this case, the force can be calculated using the equation:

Force = mass x acceleration

The acceleration can be calculated using the equation:

Acceleration = (final velocity^2 - initial velocity^2) / (2 x distance)

Given that the mass of the aircraft is 150 tons (or 150,000 kg) and the initial velocity is 288 km/h, we need to convert the velocity to m/s and the distance to meters.

Let's calculate the work done by the aircraft engine during takeoff run.

1. Convert the initial velocity from km/h to m/s: - 288 km/h = 288,000 m/3600 s = 80 m/s

2. Calculate the acceleration: - Acceleration = (final velocity^2 - initial velocity^2) / (2 x distance) - Since the final velocity is not given, we assume it to be zero (the aircraft is just starting its takeoff run). - Distance is not provided in the question, so we cannot calculate the acceleration or the work done without this information.

Unfortunately, without the distance traveled during the takeoff run, we cannot calculate the work done by the aircraft engine. Please provide the distance, and I will be happy to help you with the calculation.