Question

 Подъемный кран равномерно поднимает бетонную плиту массой 500 кг на высоту 10 м. какую работу совершает подъемный кран? какова его мощность, если подъем длится 15с ?

Answer 1

Ответ:

Работа при подъеме

А=mgh=500кг*10м*10н/кг=50000дж=50кдж

N=A/t=50000дж/15сек=3333Вт(примерно)

Answer 2

Calculation of Work Done by the Crane

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

Work = Force x Distance

In this case, the force exerted by the crane is equal to the weight of the concrete slab, which is 500 kg. The distance is the height to which the slab is lifted, which is 10 m.

Therefore, the work done by the crane can be calculated as follows:

Work = 500 kg x 10 m = 5000 kg·m

Calculation of Power of the Crane

Power is defined as the rate at which work is done. It can be calculated using the formula:

Power = Work / Time

In this case, we are given that the lifting process takes 15 seconds.

Using the previously calculated work value of 5000 kg·m, we can calculate the power as follows:

Power = 5000 kg·m / 15 s = 333.33 kg·m/s

Therefore, the power of the crane is approximately 333.33 kg·m/s.

Please note that the above calculations are based on the given information and assumptions.