Question

Полное решение плиз Время подъема грузового лифта на высоту 47 м состовляет 1,5 минуты. С какой мощностью работает его двигатель, если поднимается груз 3,2 кг? 2) Какую бес полезную работу совершает двигатель насоса, если его КПД 90% а на подъем воды из колодца на поверхность требуется 0,5 кДж работы?

Answer 1

Mgh=Nt ,N=mgh/t,N=3*10*47/90=16

Answer 2

Calculation of the Power of the Elevator Motor

To calculate the power of the elevator motor, we can use the formula:

Power = Work / Time

Given: - Height = 47 m - Time = 1.5 minutes = 1.5 * 60 seconds = 90 seconds - Mass of the load = 3.2 kg

First, let's calculate the work done by the elevator motor using the formula:

Work = Force * Distance

The force can be calculated using Newton's second law of motion:

Force = Mass * Acceleration

Acceleration can be calculated using the formula:

Acceleration = Change in Velocity / Time

Since the elevator is moving vertically, the change in velocity is equal to the change in speed. The initial velocity is 0 m/s, and the final velocity can be calculated using the formula:

Final Velocity = Distance / Time

Substituting the values, we have:

Final Velocity = 47 m / 90 s

Now, we can calculate the acceleration:

Acceleration = (Final Velocity - Initial Velocity) / Time

Substituting the values, we have:

Acceleration = (Final Velocity - 0 m/s) / 90 s

Next, we can calculate the force:

Force = Mass * Acceleration

Substituting the values, we have:

Force = 3.2 kg * (Final Velocity - 0 m/s) / 90 s

Finally, we can calculate the work done by the elevator motor:

Work = Force * Distance

Substituting the values, we have:

Work = (3.2 kg * (Final Velocity - 0 m/s) / 90 s) * 47 m

Now, we can calculate the power of the elevator motor using the formula:

Power = Work / Time

Substituting the values, we have:

Power = [(3.2 kg * (Final Velocity - 0 m/s) / 90 s) * 47 m] / 90 s

Let's calculate the final velocity, acceleration, force, work, and power using the given values.

Calculation of the Power of the Pump Motor

To calculate the useful work done by the pump motor, we can use the formula:

Useful Work = Input Work * Efficiency

Given: - Input Work = 0.5 kJ - Efficiency = 90%

The useful work done by the pump motor is equal to the input work multiplied by the efficiency:

Useful Work = Input Work * Efficiency

Substituting the values, we have:

Useful Work = 0.5 kJ * 90%

Let's calculate the useful work done by the pump motor using the given values.

Note: The search results provided by You.com do not contain relevant information for the calculations. Therefore, I will proceed with the calculations based on the given information.