Question

Подъемный кран поднимает равномерно груз массой 3000кг на высоту 20 м. Вычислите работу подъемной силы.

Answer 1

Дано: 
m=3000 кг
h=20 м
h0=0 м
g=9,8 н/кг
A-?
Формула: 
A=m*g*(h-h0)
Решение: 
А=3000 кг*9,8 Н/кг*20 м=588000 Дж=588 кДж
Ответ: А=588 кДж

Answer 2

Calculation of Work Done by the Lifting Force

To calculate the work done by the lifting force of a crane, we need to multiply the force applied by the distance over which the force is applied. In this case, the force is the weight of the load being lifted, and the distance is the height to which the load is lifted.

Given: - Mass of the load: 3000 kg - Height to which the load is lifted: 20 m

To calculate the work done, we can use the formula:

Work = Force x Distance

In this case, the force is the weight of the load, which can be calculated using the formula:

Force = Mass x Acceleration due to gravity

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

Let's calculate the work done by the lifting force:

Step 1: Calculate the force: Force = Mass x Acceleration due to gravity Force = 3000 kg x 9.8 m/s^2

Step 2: Calculate the work done: Work = Force x Distance Work = (3000 kg x 9.8 m/s^2) x 20 m

Now, let's calculate the work done:

Work = (3000 kg x 9.8 m/s^2) x 20 m

Using a calculator, we can find that the work done by the lifting force is approximately 588,000 Joules.

Please note that the above calculation assumes that the lifting force is applied vertically and there are no other factors affecting the work done, such as friction or air resistance.