Question

Швейная машина выполняет за 20мин работу 240кДж.Определите мощность электрического двигателя швейной машины.

Answer 1

T=20*60=1200 секунд
N=E/t=240*10^3 / 1200 = 200Вт

Answer 2

Calculation of Power

To determine the power of the electric motor in the sewing machine, we can use the formula:

Power = Work / Time

Given that the sewing machine completes a work of 240 kJ in 20 minutes, we can substitute these values into the formula:

Power = 240 kJ / 20 min

To calculate the power, we need to convert the time from minutes to seconds, as the unit of power is typically measured in watts (W), which is equivalent to joules per second (J/s).

1 minute = 60 seconds

Therefore, the time in seconds is:

20 min * 60 s/min = 1200 s

Now we can calculate the power:

Power = 240 kJ / 1200 s

To convert kilojoules (kJ) to joules (J), we multiply by 1000:

Power = (240 kJ * 1000) / 1200 s

Simplifying the equation:

Power = 200,000 J / 1200 s

Calculating the power:

Power = 166.67 W

Therefore, the power of the electric motor in the sewing machine is approximately 166.67 watts.