Question

помогите решить задачи 1)Какую мощность развивает подъемник,поднимающий груз весом зо кН на высоту 30м за время 1 мин 30с задача номер 2 2)Определите потенциальную энергию 10мКУБИЧЕСКИХ ВОДЫ , поднятой плотиной на высоту 44 м Помогите решить пожалуйста! Оформлениек задачи Дано: си решение: 1 2 3

Answer 1

1) Dano              Si             Analiz                      Reshenie

P = 30 kH       30000H       P = mg                    m = 30000/10 = 3000kg

h = 30 m                               m = P/g

t = 1 min 60 c   90 c            N = A/t = mgh/t        N = 3000kg*10m/c^2 *30m/90 c = 10 kBт

N - ?

Answer 2

Problem 1: Power of a Lift

To find the power developed by a lift, we need to know the weight of the load being lifted, the height it is being lifted to, and the time taken to lift it.

Given: - Weight of the load = 20 kN - Height = 30 m - Time taken = 1 minute 30 seconds = 90 seconds

To calculate the power, we can use the formula:

Power = Work done / Time

The work done is equal to the force applied multiplied by the distance moved. In this case, the force is equal to the weight of the load, and the distance moved is equal to the height.

Work done = Force x Distance

Substituting the given values:

Work done = 20 kN x 30 m

To convert kN to N, we multiply by 1000:

Work done = 20,000 N x 30 m

Now, we can calculate the power:

Power = (20,000 N x 30 m) / 90 s

Calculating this expression gives us the power developed by the lift.

Problem 2: Potential Energy of Water

To determine the potential energy of water lifted by a dam, we need to know the volume of water lifted and the height it is lifted to.

Given: - Volume of water = 10 m^3 - Height = 44 m

The potential energy of an object is given by the formula:

Potential Energy = Mass x Gravity x Height

In this case, the mass of the water can be calculated using its density and volume:

Mass = Density x Volume

The density of water is approximately 1000 kg/m^3.

Substituting the given values:

Mass = 1000 kg/m^3 x 10 m^3

Now, we can calculate the potential energy:

Potential Energy = (1000 kg/m^3 x 10 m^3) x 9.8 m/s^2 x 44 m

Calculating this expression gives us the potential energy of the water lifted by the dam.

I hope this helps! Let me know if you have any further questions.