Question

СРОЧНОООО ПОЖАЛУЙСТА 2. Кабина лифта массой 400 кг поднимается подъемным краном на высоту 12 м за 5 с. Определите среднюю мощность крана, развиваемую при подъеме

Answer 1

Я не знаю как это решить , наверное там отпечатка есть

Answer 2

Calculation of Average Power

To calculate the average power developed by the crane during the elevator's ascent, we can use the formula:

Average Power = Work Done / Time

The work done by the crane can be calculated using the formula:

Work Done = Force × Distance

In this case, the force exerted by the crane is equal to the weight of the elevator, which is given as 400 kg. The distance traveled by the elevator is 12 m, and the time taken for the ascent is 5 s.

Let's calculate the average power:

Step 1: Calculate the force exerted by the crane: The weight of the elevator can be calculated using the formula:

Weight = Mass × Acceleration due to gravity

The acceleration due to gravity is approximately 9.8 m/s^2.

Weight = 400 kg × 9.8 m/s^2 = 3920 N

Step 2: Calculate the work done by the crane: Work Done = Force × Distance

Work Done = 3920 N × 12 m = 47040 J (joules)

Step 3: Calculate the average power: Average Power = Work Done / Time

Average Power = 47040 J / 5 s = 9408 W (watts)

Therefore, the average power developed by the crane during the elevator's ascent is 9408 watts.

Please note that the above calculation is based on the given information and assumptions.