Question

Под действием силы тяжести 1000Н автомобиль движется со скоростью 72 км/ч. Чему равна мощность движения

Answer 1

N=A/t, где A=FS
N=FS/t, где S/t=V
N=F*V
N=1000 Н * 20 м/с = 20000 Вт

Answer 2

U - скорость ( 72 км / ч = 20 м / с )
F - сила тяжести ( 1000 Н )
N - мощность ( ? )

N = F * U = 1000 Н * 20 м / с = 20 000 Вт = 20 кВт

Ответ : 20 кВт

Answer 3

Calculation of Power

To calculate the power of the moving car, we need to know the force acting on the car and its velocity. In this case, the force acting on the car is the force of gravity, which is given as 1000 N, and the velocity of the car is 72 km/h.

The formula to calculate power is:

Power = Force x Velocity

Let's calculate the power using the given values:

Force = 1000 N

Velocity = 72 km/h

First, we need to convert the velocity from km/h to m/s, as the SI unit of power is watts (W), which is equal to joules per second (J/s).

1 km/h is equal to 0.2778 m/s. Therefore, the velocity in m/s is:

Velocity = 72 km/h x 0.2778 m/s = 20 m/s

Now, we can calculate the power:

Power = Force x Velocity = 1000 N x 20 m/s = 20,000 W

Therefore, the power of the car's motion is 20,000 watts.

Please note that the above calculation assumes that the force of gravity is the only force acting on the car and that there are no other factors affecting the car's motion.