Question

Колесо движущейся автомашины за 47 сек совершает 400 оборотов.Длина внешней окружности колеса 235 см.Какова скорость автомашины. С решением пожалуйста.

Answer 1

1) 235•400 = 94000 см проезжает автомашина за 47 секунд.
2) 94000 см = 940 м 
3) 940:47 = 20 м/с - скорость автомашины.
4) 20•3600:1000 =72 км/ч - скорость автомашины.
Ответ: скорость автомашины 72 км/ч.

Answer 2

Calculation of Car Speed

To calculate the speed of the car, we need to use the formula:

Speed = Distance / Time

Given information: - The wheel of the moving car completes 400 revolutions in 47 seconds. - The circumference of the wheel is 235 cm.

To find the distance covered by the car, we need to calculate the total distance covered by the wheel in 47 seconds. Since the wheel completes 400 revolutions, the distance covered by the wheel is equal to the circumference of the wheel multiplied by the number of revolutions.

Let's calculate the distance covered by the wheel:

Distance = Circumference of the wheel * Number of revolutions

Distance = 235 cm * 400

Now, we can calculate the speed of the car:

Speed = Distance / Time

Speed = (235 cm * 400) / 47

Calculating this expression will give us the speed of the car in cm/s.

Let's calculate the speed:

Speed = (235 * 400) / 47 cm/s

Using a calculator, we can find the value of the expression:

Speed ≈ 2000 cm/s

Therefore, the speed of the car is approximately 2000 cm/s.

Please note that this calculation assumes that the wheel is rolling without slipping and there is no slippage between the wheel and the road surface.