Question

Паровая машина поднимает молот массой 500кг 120 раз в минуту на высоту 60см. Мощность машины 8,82кВт. Определите КПД

Answer 1

......................

Answer 2

∫-(КПД, допустим)
∫=Aп:Aз
Ап=mgh
Аз=M*T
Ап=0,6м*5000Н
Аз=8820Вт*120
Ап=3000Дж
Аз=1058400Дж
∫=3000ДЖ:Дж
∫≈0,2%)) такая выгода)))

Answer 3

Calculating the Efficiency of the Steam Engine

To calculate the efficiency of the steam engine, we can use the formula:

Efficiency (η) = (Useful output energy / Input energy) x 100%

In this case, the useful output energy is the work done by the steam engine in lifting the hammer, and the input energy is the power supplied to the steam engine.

Calculating Useful Output Energy

The useful output energy is the work done by the steam engine in lifting the hammer. We can calculate this using the formula:

Useful output energy = Force x Distance

Given: - Mass of the hammer (m) = 500 kg - Height lifted (h) = 60 cm = 0.6 m - Number of times lifted per minute = 120 times - Acceleration due to gravity (g) = 9.81 m/s^2 (standard value)

The force required to lift the hammer is equal to its weight: Force = mass x acceleration due to gravity Force = 500 kg x 9.81 m/s^2

Now, we can calculate the work done per lift: Work done per lift = Force x Distance Work done per lift = (500 kg x 9.81 m/s^2) x 0.6 m

To find the total useful output energy per minute, we multiply the work done per lift by the number of lifts per minute: Total useful output energy per minute = Work done per lift x Number of lifts per minute

Calculating Input Energy

The input energy is the power supplied to the steam engine. We are given that the power of the machine is 8.82 kW (kilowatts).

To find the input energy per minute, we can use the formula: Input energy per minute = Power x Time

Given: - Power of the machine = 8.82 kW - Time = 1 minute

Calculating Efficiency

Now that we have the values for the useful output energy and the input energy, we can calculate the efficiency using the formula: Efficiency (η) = (Useful output energy / Input energy) x 100%

By plugging in the calculated values, we can find the efficiency of the steam engine.