Question

При равномерном движении игрушечный автомобиль развивает скорость 0,5м/с и мощность 2 Вт. Сила сопротивления движению равна 2Н. Найдите КПД автомобиля.

Answer 1

1)N=F1 v F1=N/v=4Н К. П. Д. =(F1-F2)/F1 *100 0/0=50 0/0 (процентов) 
где F2=2н 
2)A=FS F=A/S=mgh/S=2*9,8*1/0,1=196н

Answer 2

Calculation of Efficiency (КПД) of the Toy Car

To calculate the efficiency (КПД) of the toy car, we need to use the formula:

КПД = (Useful Power Output / Power Input) x 100%

In this case, the useful power output is the power used to overcome the resistance to motion, and the power input is the total power supplied to the car.

Given information: - Speed of the toy car: 0.5 m/s - Power of the toy car: 2 Watts - Force of resistance to motion: 2 Newtons

To find the useful power output, we can use the formula:

Useful Power Output = Force x Velocity

In this case, the force is the force of resistance to motion, and the velocity is the speed of the car.

Let's calculate the useful power output first:

Useful Power Output = 2 N x 0.5 m/s = 1 Watt

Now, we can calculate the efficiency (КПД) using the formula mentioned earlier:

КПД = (1 Watt / 2 Watts) x 100% = 50%

Therefore, the efficiency (КПД) of the toy car is 50%.

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