Question

двигатель подъемного крана мощностью 6Квт поднимает груз массой 6т на высоту 8м.Определите время подъемагруза,если КПД установки равен 80%С ОБЪЯСНЕНИЯМИ ПОЖАЛУЙСТА...

Answer 1

Если в задаче хоть каким-то образом упоминается КПД, то начинаем всегда с формулы КПД:

$n=\frac{N_1}{N_2}=\frac{A}{tN_2}=\frac{mgh}{tN_2}$

Выражаем время t

$t=\frac{mgh}{nN_2}=$

Подставляем, считаем

$t=\frac{6000kg*10m/s^2*8m}{0.8*6000Vt}=100s$

Ответ: 100 секунд

Answer 2

n-КПД

n=Aп/Aз*100%

Aп=mgh

Aз=Pt

n=mgh/Pt

t=mgh/Pn=6000*10*8/0,8*6000=100с

Ответ: 100с

Answer 3

Calculation of Time for Lifting a Load by a Crane

To determine the time it takes for a crane to lift a load, we need to consider the power of the crane's engine, the mass of the load, the height it needs to be lifted, and the efficiency of the crane's system.

Given: - Power of the crane's engine: 6 kW - Mass of the load: 6 tons (or 6000 kg) - Height to be lifted: 8 m - Efficiency of the crane's system: 80%

To calculate the time it takes for the crane to lift the load, we can use the formula:

Time = Work / Power

The work done by the crane is equal to the gravitational potential energy gained by the load. The gravitational potential energy can be calculated using the formula:

Gravitational Potential Energy = Mass * Gravitational Acceleration * Height

The gravitational acceleration is approximately 9.8 m/s^2.

Let's calculate the time step by step:

1. Calculate the gravitational potential energy gained by the load: - Mass = 6000 kg - Gravitational Acceleration = 9.8 m/s^2 - Height = 8 m

Gravitational Potential Energy = 6000 kg * 9.8 m/s^2 * 8 m = 470400 J 2. Calculate the work done by the crane: - Work = Gravitational Potential Energy = 470400 J

3. Calculate the time using the formula: - Power = 6 kW = 6000 W - Efficiency = 80% = 0.8

Time = Work / (Power * Efficiency) = 470400 J / (6000 W * 0.8) = 98 seconds Therefore, it would take approximately 98 seconds for the crane to lift the 6-ton load to a height of 8 meters, assuming an efficiency of 80%.

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